JPH079527B2 - Camera with multiple micro-computers - Google Patents

Description

TECHNICAL FIELD The present invention relates to a camera including a plurality of microcomputers.

2. Description of the Related Art Conventionally, a camera having a plurality of microcomputers is known. That is, a microcomputer is used for controlling the operation of the camera and a microcomputer for controlling the display.

Problems to be Solved by the Invention Here, in order to perform high-speed processing, a microcomputer for operation control has a high-frequency oscillation clock (for example, 4.
19MHz), while the microcomputer for display control needs to have a processing speed (eg 32.765KHz) sufficient for the photographer's operation. In a camera equipped with such multiple microcomputers,
When data to be displayed on the display control microcomputer is transferred from the operation control microcomputer at the time of power-on reset, the operation control microcomputer is affected by the difference in the rising speeds of both oscillation circuits and the difference in the program processing speed. The display control microcomputer may not be ready to receive data even though the device is ready to send data. In such a case, even if data is transmitted from the operation control microcomputer to the display control microcomputer, the display control microcomputer does not accept this data, so that it is possible that an appropriate display is not made at power-on reset. There is a nature.

Therefore, an object of the present invention is to provide a camera equipped with a plurality of microcomputers having different oscillation frequencies as described above, which is surely controlled by a high-speed clock without the above-mentioned problem of data transfer. And to provide a camera capable of operating by communicating data between a microcomputer controlled by a low speed clock and a microcomputer.

Means for Solving the Problems In order to achieve the above object, a camera provided with a plurality of microcomputers according to the present invention includes: a first microcomputer that operates based on an oscillation clock of a first frequency; A second microcomputer that operates in association with the first microcomputer and that operates based on an oscillation clock of a second frequency that is slower than the first frequency; an oscillation clock of the first frequency; Starting means for starting the oscillation of the oscillation clock of the second frequency, and a predetermined time from the start of the oscillation of the oscillation clock of the second frequency by the starting means until the oscillation becomes stable, And a delay means for delaying the start of operations associated with the two microcomputers.

Therefore, according to the present invention, the first microcomputer has been reset by the first reset means and started to operate, and then the predetermined time required for the oscillation clock of the second frequency to stabilize has elapsed. Then, the operation of the first microcomputer, which is related to the operation of the second microcomputer, is started.

Embodiments Embodiments of the present invention will be described in detail below with reference to the drawings.

First, FIG. 1 is a top view showing the external appearance of a camera according to an embodiment of the present invention, and FIG. 2 is a front view thereof, which show operation members and display members related to the present invention. In FIGS. 1 and 2, a display unit (600) is arranged on the upper surface of the camera body (1).
00) is the shooting mode display, frame count value display,
Various kinds of information such as a film sensitivity value display, a battery consumption warning display, a film feed state display, etc. are displayed in a concentrated manner. The display unit (600) is composed of a liquid crystal display panel.

Reference numeral (820) is a main switch which can be slid in the front-back direction of the camera body (1), and when set to the “LOCK” position, all the circuit of the camera described later becomes inoperable, and conversely “O”
Set to N "position for normal operation. (800)
Is a shutter button. When it is pressed to half the stroke, the metering switch (SW ₁ ) described later is closed and the metering circuit etc. described below starts operating. ₂ ) is closed and the shutter is released.

Reference numeral (804) is a shooting mode switching key, and a program mode and a manual mode can be selected alternately each time the key is pressed. (803) is an ISO key. If you press this key (803), the film sensitivity value (ISO value) currently set in the camera will be called up and displayed on the display unit (600) only during that time. ing. (805) (806)
Reference numerals (807) and (808) are an up key A, a down key A, an up key B and a down key B, respectively, which are used to change the set value of the camera. For example, ISO key (80
If you press the up key A (805) or down key A (806) while pressing 3), the IS displayed on the display (600) will be displayed.
The O value changes in the specified direction, and the ISO value setting can be changed. Also, when the manual mode is set by the shooting mode key (804), the up key A (80
5) Or, when the down key A (806) is pressed, the shutter speed value displayed on the display section (700) in the finder, which will be described later, changes, and the desired shutter speed value can be set. Similarly, when the up key B (807) or down key B (808) is pressed in the manual mode, the aperture value displayed on the display (700) in the viewfinder changes and the desired aperture value can be set. it can. (811) is a rewinding switch which is operated when rewinding the film.

FIG. 3 is a block diagram showing the circuit configuration of this embodiment. In FIG. 3, (100) is a main power battery of the camera, (110) is a power circuit connected to the main power battery (100), and (120) is a battery for checking the voltage of the main power battery (100). It is a check circuit. Here, the power supply circuit (11
0) receives Vdd ₀ power from the main power battery (100),
The voltage Vcc and the voltage Vdd ₁ are made constant and power is supplied to each circuit described later. And this power circuit (110)
The output voltage Vcc of the output voltages Vcc and Vdd ₁ can be controlled by a signal input to the input terminal (111) of the power supply circuit (110), and the input signal of the input terminal (111) is The output voltage Vcc is cut off when set to the "High" level, and the output voltage Vcc is output when the input terminal (111) is set to the "Low" level. The output voltage Vdd ₁ is always output. The battery check circuit (120) constantly monitors the output voltage Vdd ₀ of the main power supply battery (100) while the voltage Vcc is being output, and indicates the state of the battery according to the voltage level of the output voltage Vdd _0. Output a signal.

(200) is a control circuit for controlling the sequence of the camera body (hereinafter referred to as a control CPU), and all the circuits described below are designed to operate under the control of the control CPU (200). (210) is a photometric circuit, which performs AD conversion of the photometric photoelectric conversion amount (corresponding to the subject brightness value) by the photometric element (211) that performs TTL photometry and controls it as information about the subject brightness Bv.
Send to CPU (200). Reference numeral (220) is an aperture control circuit, which controls the aperture (F value) of the taking lens based on a command from the control CPU (200). A shutter control circuit (230) controls the traveling timings of the front and rear curtains of the shutter based on a command of shutter speed information from the control CPU (200).

Further, (240) is a motor drive circuit, and the control CPU (20
Motor M ₁ (241) and motor M ₂ (24
2) drive each. Here, the motor M ₁ (241) is
It is used for both the drive operation and the film winding operation during the shutter release for raising the main mirror of the single-lens reflex camera, and the shutter release operation is performed by the forward rotation and the film winding operation is performed by the reverse rotation. On the other hand, the motor M ₂ (242) is a motor exclusively for film rewinding,
When this motor M ₂ (242) is driven, the winding motor M
The drive thread of ₁ (241) is automatically separated from the film by a clutch mechanism or the like, and the film is rewound. Here, a mechanism for performing a shutter release operation, a film winding operation, and a film rewinding operation by a motor is a known technique and is not the subject of the present invention, and therefore will not be described in detail.

(250) is a contact provided on the film cartridge for detecting the DX code indicating the film sensitivity. Through this contact (250), the control CPU (200) is the film sensitivity value coated on the surface of the film cartridge. It is designed to read (ISO value). Reference numeral (260) is an oscillator circuit, which supplies a reference clock to the control CPU (200). Here, since the control CPU (200) needs to control various operations of the camera with high time accuracy, an oscillation circuit with a high frequency (for example, 4.19 MHz) is used as the oscillation circuit (260).

(261) is a reset capacitor for the control CPU (200), which controls C when the power battery (100) is loaded into the camera.
Reset the PU (200). (262) is the control CPU (20
0) Ground terminal. Reference numeral (270) is a lens data output circuit which is built in the taking lens mounted on the camera body (1) and outputs various data such as the maximum aperture value, the maximum aperture value and the focal length of the taking lens.

Furthermore, (280) is an IC for data memory, and this memory IC is always backed up by a backup battery (290) consisting of a lithium battery so that the stored data is not erased due to the voltage drop of the power supply battery (100). Has been done. This memory IC (280) is a RAM (Randam Access
Memory), the frame count value is written and read from the control CPU (200) as needed.
That is, in this embodiment, the memory in the control CPU (200) cannot store and hold data when the main power battery (100) is exhausted or removed, so data that should not be erased (for example, frame count Value) is stored in this memory IC (280) and another power supply (290)
It is a reason to back up.

(500) is a display circuit that drives the display unit of the camera,
For example, it is composed of a 4-bit microcomputer with a liquid crystal display drive circuit. Reference numeral (600) is a display unit formed of a liquid crystal display panel provided on the upper surface of the camera body (1),
Reference numeral (700) is a display unit formed of a liquid crystal display panel provided in the viewfinder. Reference numeral (510) is a bias circuit for generating a bypass voltage for driving the liquid crystal, and the output of this circuit (510) is supplied to the display circuit (500). ) Drive waveforms are synthesized.

(SW ₁ ) and (SW ₂ ) are switches linked to the shutter release button (800) of the camera. When the photographer presses the shutter release button (800) halfway, the metering switch (SW ₁ ) turns on and When photometry is started and the shutter release button (800) is pressed all the way in again, the release switch (SW ₂ ) turns on and the shutter is released. (SW iso) is a switch linked to the ISO key (803). When the switch (SW iso) is turned on by pressing the ISO key (803), the ISO value (film sensitivity value) set inside the camera only during that time. Is called,
It is designed to be displayed on the display (600) on the body.

(SW mod) is a mode switch that works in conjunction with the mode key (804), and in this embodiment, every time the mode key (804) is pressed, a program mode and a manual mode are alternately set as the exposure control mode. It is like this. (SW ua) is a switch linked to the up key A (805), and (SW da) is a switch linked to the down key A (806). In this embodiment, the display unit (60
Pressing the up key A (805) while the ISO value is being recalled by operating the ISO key (803) on the 0) key, the ISO set value can be changed in the increasing direction, and the down key A (80
You can change it in the decreasing direction by pressing 6). On the other hand, when the exposure control mode is manual mode,
The shutter speed setting value can be increased or decreased by operating the up key (805) and the down key (806). Further, (SW ub) is a switch linked to the up key B (807), and (SW db) is a switch linked to the down key B (808). These keys are used to increase or decrease the aperture setting value when the exposure control mode is the manual mode.

(SW sls) is a film detection switch provided on the film winding spool shaft of the camera. It is closed (ON) when the film is not normally wound on the spool, and opens when it is normally wound. It will be in the state (OFF). (S
W rew) is a film rewinding switch, and when the film is loaded, this switch (SW rew) is turned on to automatically rewind the film. (SW rc) is a switch that works in conjunction with opening and closing the back cover of the camera. When the back cover is closed, the switch (SW rc) is closed (ON), and when the back cover is opened, the switch (SW rc) is open (OFF). Become. (SW sp) is a switch that opens and closes in conjunction with the rotation of the film rewinding shaft, and is opened and closed once when the rewinding shaft is rotated a half turn, for example. Here, among the above-mentioned switches, (SW ₁ ) (SW ₂ ) (SW iso) (SW mod) (SW ua) (S
Each signal generated by the operation of W da) (SW ub) (SW db) (SW rew) and (SW rc) can activate the control CPU (200). That is, when the signals from these switches are input while the control CPU (200) is in the standby state, the control CPU (200) exits from the standby state and enters the normal operating state, and the processing corresponding to each input signal is performed. Is designed to do. The operation of the control CPU (200) at this time will be described later. Furthermore, (SW m) is a switch linked to the main switch (820) of the camera. When this switch (SW m) is open (OFF), the camera is locked, and when it is closed (ON), the camera operates. It has become.

Reference numeral (500) is a display circuit, and a 4-bit microcomputer is used in this embodiment. The control CPU (20
Data communication between the display circuit (500) and the display circuit (500) is based on the serial data communication method using the bus line (300). Here, the bus line (300) transmits a signal line (301) for transmitting a serial lock signal (Sck), a signal line (302) for transmitting a serial data signal (Sout), and a display circuit selection signal (CSDSP). Signal line (303)
It consists of

When the control CPU (200) wants to send data to the display circuit (500), the control CPU (200) switches the display circuit selection signal (CSDSP) from "H" to "L" (CSDSP in this example).
After the signal is valid at "Low"), the serial data signal (Sou) is synchronized with the serial clock signal (Sck).
t) is sent to the display circuit (500) by a predetermined bit number (byte number). Here, display circuit selection signal (CSDSP)
The signal line (303) for transmitting the signal is connected to the external interrupt terminal (INT) of the display circuit (500). Therefore, when the signal line (303) switches from "H" to "L", the display circuit (500) is interrupted and the display circuit (500) is controlled.
It is possible to know that serial data is being sent from the CPU (200). (501) and (502) are a power supply terminal and a ground terminal of the display circuit (500), respectively.

Reference numeral (503) is a reference clock generation circuit for generating a reference clock for driving the display circuit (500), and its oscillation frequency is a frequency sufficient for processing display data and displaying response (for example, 32.765 KHz). As the power consumption is suppressed. Reference numeral (504) is a capacitor for resetting the power supply of the display circuit (500). (510) is, as mentioned above,
A bias circuit for supplying a bias voltage for liquid crystal display to a display circuit (500). Furthermore, (530) is both display (60
0) are signal lines for transmitting four common signals for driving (700), and (541), (542) and (543) are segment signal lines for transmitting segment signals. Of these segment signal lines (541) (542) (543), the signal line (514) is wired only to the display unit (600), and the signal line (542) is only the display unit (700). The signal line (543) is commonly wired to both display units (600) and (700) (the liquid crystal drive method in this example is (1/4 duty, 1/3 bias). The method will be described as an example.) FIGS. 4 and 5 are specific examples of the display mode of the display unit of the camera, and FIG. 4 shows the display unit (60
0) shows the display mode, and FIG. 5 shows the display mode of the display unit (700) provided in the finder.

First, the display elements of the display unit (600) on the upper surface of the main body will be described. In FIG. 4, (601) and (602) indicate the exposure control mode of the camera. When the camera or program mode is set, the display element (601) lights up and the "PROGR
When "AM" is displayed and the manual mode is set, the display element (602) lights up and "M" is displayed (611).
Reference numerals (612) and (613) are display elements for teaching the photographer necessary operations for film loading and rewinding. When the film is not loaded, the display element (611) and the display element (612) are turned on at the same time. Then, “LOAD FILM” is displayed and the loading of the film is requested. Further, when the shooting of the loaded film is completed, the display element (612) and the display element (613) are turned on at the same time and "FILM END" is displayed to indicate the end of the shooting and the rewinding operation. Further, in the normal photographing state, only the display element (612) is lit and displayed, and constitutes a frame counter together with frame counter display numbers (631) (632) described later.

(615) is a display element that shows the state of the main power supply battery (100) of the counter. It turns off when the remaining battery power is sufficient, and when the battery is exhausted and enters the warning area, it flashes at 1 Hz, for example. It is what is done. (631) (632) (633) are numerical display elements each consisting of 7 segments,
Reference numeral (634) is a display element which displays the number "0" by a single electrode. In this way, display elements (631) (632)
(633) and (634) form a four-digit number, and a plurality of types of displays are switched and displayed by using the same segment also as follows. That is, first, the first two digits of the display elements (631) and (632) display the count value of the frame counter, and together with the above-mentioned "FILM" display element (612), a frame counter is formed. Further, the second is the "ISO" mark display element (614) and the number display elements (631) (632) (6
33) (634) using all 4 digits and film sensitivity (ISO value)
Is displayed. It is also possible to use this numerical display to display the elapsed time (seconds) during bulb exposure or the time display (seconds) during self-timer photographing.

Further, (622) is a display element indicating the winding direction,
Reference numeral (623) is a display element indicating the rewinding direction. During the winding operation after shutter release, this display element (622)
Lights up to indicate that the winding operation is proceeding normally. Also, when the film loaded in the camera has finished shooting all frames and entered the winding operation, the film is in a taut state. At this time, the winding direction display element (622)
And the above-mentioned display element (612) (6
13) and flash at the same time, for example at 2 Hz, to indicate the end of the film. Further, during rewinding of the film, the rewinding direction display element (623) blinks at, for example, 2 Hz to indicate that the rewinding is proceeding normally.

Further, (621) is a cartridge mark (624) is a film set mark, and (625) (626) (627) is a bar display element for displaying the film rewinding remaining amount. Here, if the film is properly loaded in the camera, the patrone mark (621) and the film set mark (624) are lit, but if the film is not properly loaded, both marks (621) are displayed. ) (624) is not displayed.

On the other hand, when the rewind switch (811) shown in FIG. 1 is operated to rewind the film, the cartridge mark (62
In addition to 1) and the film set mark (624), the bar rewind remaining amount display bar display elements (625) (626) (627) are newly added and displayed, and the rewind display initial state is entered.
At this time, the four bar display elements (624) (625) (626) (627) graphically represent the length corresponding to the total length of the film to be rewound, and the rewinding progresses. In accordance with the display element (62
7) The bars are turned off one after another in the order of (626) and (625), and when the film rewinding is completed, the motor is stopped and the bar display element (624) is turned off and the rewinding is completed. To do. Therefore, only the cartridge mark (621) remains when the rewinding is completed. It should be noted that during rewind display, displays other than the rewind-related display (mode display, frame counter degree) may be displayed at the same time, but in order to bring out the rewind bar graph display described above, It is desirable to delete everything except the rewind bar graph display. Further, in the present embodiment, the bar display element is turned off every about 1/4 of the entire stroke, but the present invention is not limited to this.

Next, the display elements of the in-finder display section (700) will be described with reference to FIG. In Figure 5, (701) (7
02) is a display element that displays the exposure control mode of the camera. When the camera is set to the program mode, the display element (701) lights up and "P" is displayed, and when it is set to the manual mode, it is displayed. The element (702) lights up and "M" is displayed. (711) (712) (713) (714) is 4
It is a numerical display element that constitutes a digit of a digit and displays the shutter speed. (721) and (722) are numerical display elements that show two-digit numbers, and a decimal point display element (723)
Together with the aperture value. Furthermore, (731) (7
32) is an index that indicates whether the photometric value is under, correct, or over the set value when the exposure control mode is the manual mode. (733) is a battery mark, which indicates the state of the main power battery (100) of the camera in the same way as the battery mark (615) in FIG. 4, and it turns off when the battery level is sufficient. When the battery runs out and enters the warning area, for example, it blinks at 1 Hz.

Among the above display elements, a display element (601) that displays “PROGRAM”, a display element (701) that displays “P”, and a display element (6) that displays “M” each other.
02) and (702) and two battery marks (615)
(733) are branched and driven in parallel from the display circuit (500) by the same drive signal.

Here, in the present embodiment, the blinking cycle of the display element is
1Hz for flashing battery marks (615) (733)
And the blinking of other display elements is set to 2 Hz. This is a consideration for the battery consumption warning display when the temperature is low. That is, when the temperature is low, the response speed of the liquid crystal is low, so that it becomes more difficult to blink at high speed as the temperature is low, while the battery performance is low at low temperature, so that the probability of battery check is higher than that at normal temperature. Therefore,
In this embodiment, only the blinking cycle of the battery marks (615) (733) is set longer than the blinking cycles of the other display elements so that the blinking display of the battery consumption warning can be clearly recognized even at low temperatures.

Next, the data content of the serial data transmitted from the control CPU (200) to the display circuit (500) using the serial data bus line (300) will be described. Table 1 shows an example of the contents of serial data.

Table 1 shows an example of the contents of serial data.
A series of serial data strings from the 1st byte to the 5th byte constitutes one communication from the control CPU (200) to the display circuit (500), and the meaning of each bit is predetermined. As shown in Table 1, the upper 5 bits (b _{17 to} b ₁₂ ) of the first byte of this serial data indicate aperture value display information (Av value), and the integer part 4 bits (b _{17 to} b ₁₄ ) And the fractional part 2 bits (b _{13 to} b ₁₂ ) have a display resolution of 1/4 Av unit. The lower 2 bits (b
₁₁ , b ₁₀ ) is the display data of the over / under index (731) (732) in the metered manual. When b ₁₁ = 1, the display element (731) is lit, and when b ₁₀ = 1, it is displayed. The element (732) is displayed.

Furthermore, the upper 5 bits (b _{27 to} b ₂₂ ) of the 2nd byte indicate shutter speed display information (Tv value), and the integer part 4 bits (b ₂₇
~ B ₂₄ ) and 2 bits of fractional part (b ₂₃ , b ₂₂ ) 1 / 4T
Has a display resolution of v units. The lower 2 bits (b ₂₁ , b ₂₀ ) of the second byte are battery check information. b ₂₁ is a battery low warning flag, when the b ₂₁ = 1 prompting the replacement of the battery flashing display the battery mark (615) (733). b ₂₂ is a flag indicating the operating limit determination result, when the b ₂₂ = 1 turns off all display elements to indicate that that can not be guaranteed the operation of the camera by the battery depletion.

The third byte shows the film speed information (Sv value). The most significant bit (b ₃₇ ) of this 3rd byte is the ISO display instruction,
b ₃₇ = 1, the ISO value is displayed preferentially. Lower bits (b ₃₆ ~b ₃₀₎ indicates the film sensitivity (Sv value), the integer unit 5
Is because the bits (b ₃₆ ~b ₃₂₎ and fraction part 2 bits (b _31, b ₃₀₎ has a display resolution of 1 / 4Sv units.

The most significant bit (b ₄₇ ) of the 4th byte is information regarding the exposure control mode. When b ₄₇ = 0, the program mode is set, and when b ₄₇ = 1, the manual mode is set.
The lower 2 bits (b ₄₁ , b ₄₀ ) of the 4th byte are information relating to the drive state of the motor. When b ₄₁ and b ₄₀ = 00, the motor is off and is not working. b ₄₁ , b ₄₀ = 0
When 1, the film is being wound up by the motor. When b ₄₁ , b ₄₀ = 11, it means that the film winding has not been completed within the specified time during the film winding operation in the mode, that is, the winding of all filmable frames of the film has been completed. . Furthermore, b ₄₁ , b
_{When 40} = 10, it indicates that the frame rewinding operation is in progress.

Furthermore, the lower 6 bits (b
₅₅ ~b ₅₀₎ shows the frame counter value has become a binary code data.

Next, FIGS. 6 to 12 show flowcharts for controlling the sequence of the control CPU (200). First, Fig. 6 shows the control CPU (20) when the main power battery (100) is attached to the camera.
It is a power-on reset routine showing the operation of (0).
In FIG. 6, the control CPU (200) initializes all I / O ports in step C100, and then executes R in step C102.
Initialize AM. This RAM includes a serial data register for serial communication, a flag register, etc. in addition to a RAM for a normal data memory. Next, in step C104, the DX code of the film loaded in the camera is read through the DX contact (250), and in step C106, the film sensitivity information therein is converted into ISO value data and set in the serial data register.

Then, in step C110, the film detection switch (SW sls)
Check, if the OFF That film is loaded successfully proceeds to step C112, it reads the frame count value is the memory in the memory IC (280), stored in b ₅₅ ~b ₅₀ of the serial register. On the other hand, step C1
If the film detection switch (SW sls) is turned on in 10, that is, if the film is not loaded normally, the frame count value (b _{55 to} b ₅₀ ) of the serial register is cleared in step C120, and the memory IC ( Write the frame count value "0" to 280). After execution of step C112 or step C122, proceed to step C130, wait for a short waiting time (for example, 500 msec), and then
In step C132, the contents of the serial register are transmitted to the display circuit (500) through the serial data bus (300), and then the standby state is entered.

By the way, as mentioned above, control that requires high-speed processing capability
The reference clock frequency of the CPU (200) is high (eg 4.19MH
z) Since the clock frequency of the display circuit (500) that does not require high speed is low (for example, 32.768KHz), the voltage (Vdd ₁ ) is supplied to both circuits (200) (500) at the same time by loading the battery (100). However, the timing at which the program starts due to the power-on reset is different. That is, in general, a high-speed control CPU (200) has a faster clock oscillation and a stable power-on reset to start program execution, whereas at that timing, an oscillation circuit (503) of a display circuit (500). May not oscillate stably, so the display circuit (500) program may not be started. Also, both circuits (200) (500)
Even if it is assumed that the two programs have started executing at the same time, the display circuit (500) finishes initial processing by power-on reset compared to the control CPU (200) because the execution time per instruction is different from each other. It is usually delayed considerably. Therefore, the control CPU (200) of the present embodiment provides a waiting time in step C130 of the power-on reset routine, and sees that the display circuit (500) finishes initial processing and is ready to receive serial data. By sending serial data, it is ensured that a normal display is displayed when the battery is installed.

Further, the control CPU (200) can be activated from a standby state when an interrupt signal is input by an activation signal from the outside. In the present embodiment, a photometric switch (SW ₁ ) and a release switch (SW ₂ ) interlocking with the shutter release button (800), a switch (SW iso) interlocking with the ISO key (803), and a mode key (804) are interlocked. Switch (SW mod), Up / Down keys A, B (805) (806)
Switch (SW ua) linked to (807) and (808) respectively
(SW da) (SW ub) (SW db) Rewind switch (81
The signals from the switch (SW rew) interlocking with 1), the switch (SW rc) interlocking with the opening and closing of the back cover, and the switch (SW m) interlocking with the main switch (820) correspond to the activation signal.

FIG. 7 shows the control CPU (200) according to the various start signals described above.
5 is a flow chart showing a process when is activated from the standby state. In FIG. 7, first, step C200.
By setting the input terminal (111) of the power supply circuit (110) to Low level, the power supply voltage Vcc is supplied and at the same time the battery check circuit (120) is activated. Next, in step C202, read the information on the back cover switch (SW rc) to check if this interrupt activation has been triggered by closing the back cover. The initial loading process of the film is performed by a subroutine "SUB-C4" described later. In this initial loading process, the film is automatically fed for four frames and stopped. (The subroutine "SUB-C4" will be described in detail later.) Then, after the initial loading process is completed in step C280, the power supply voltage Vcc is turned off in step C282.
Then enter the standby state.

If it is determined in step C202 that the operation is not performed by closing the back cover, the process proceeds to step C204 and the rewind switch (SW r
ew) to check if it is started. If it is not started by rewinding, proceed to step C206 to activate the photometric circuit (210) to start AD conversion of the photometric value.
After waiting for the photometric circuit (210) to stabilize in step C208, the photometric value data is measured in step C210.
The lens data is also captured from the lens data circuit (270). Then, in step C212, exposure calculation is performed based on the fetched data, and the obtained aperture value (Av value) and shutter speed value (Tv value) are written in a serial register, and in step C214 the display circuit (50
Serial data transmission of this Av value and Tv value is performed to (0).

Next, in step C212, it is checked whether or not the relays switch (SW ₂ ) is turned on. If not, proceed to step C218, and if it is turned on, step C240
Fluffy. Here, if the release switch (SW ₂ ) is not turned on, the metering switch (SW ₁ ) is turned on in step C218.
If it is turned on, proceed to step C220 to scan all the operation switches and keys of the camera, and if there are operated switches and keys, perform the corresponding processing and then step again. Return to C210. Here, details of the scanning routine of step C220 will be described later with reference to FIG.

In FIG. 7, while the photometry switch (SW ₁ ) is ON, the loop of steps C210 to C216 to C218 to C220 to C210 is rotated (hereinafter referred to as the photometry loop), but at step C218, photometry is performed. When the switch (SW ₁ ) is turned off, the program proceeds to step C230 to stop the photometric operation, turns off the power supply voltage Vcc in step C232, and then enters the standby state.

On the other hand, when it is detected during step C216 that the release switch (SW ₂ ) is turned on during the photometry loop, the process exits from the photometry loop to step C240, and all serial data held at that time is finally controlled for exposure. The data is sent again to the display circuit (500), and in step C242, the motor M ₁ (241) is normally rotated to start the release operation. First, in step C242, the main mirror (not shown) starts to rise due to the normal rotation of the motor M ₁ (241), and in step C244, the aperture is stopped down to the aperture value (Av value) obtained by the exposure calculation. The control operation for collapse is executed. Next, in step C246, the state of the switch (not shown) for detecting the completion of the raising of the main mirror is checked, and the process waits until the raising is completed while looping around the loop of step C246. Then, when the raising of the main mirror is completed, the process proceeds to step C248, the rotation of the motor M ₁ (241) is stopped, and the actual shutter speed is calculated from the shutter speed value (Tv value) obtained by the exposure calculation in step C212 in step C250. The control time value is calculated, and in step C252, the front curtain and the rear curtain of the focal plane shutter are controlled according to the time to perform the shutter control operation. Then step C2
After a little waiting time (for example, 20 msec) at 54, the film winding operation is performed by the subroutine "SUB-C2" at step C256. Details of the operation of the subroutine "SUB-C2" will be described later. When the film winding operation is completed in step C256, the process returns to step C210 to return to the photometry loop.

By the way, in step C204, the rewind switch (SW rew)
If it is determined that the film rewinding is started, the process jumps to step C290, the film rewinding control operation is executed by the rewinding subroutine "SUB-C3", and then the power supply voltage Vcc is turned off in step C292 to enter the standby mode. Details of the rewinding subroutine "SUB-C3" in step C290 will be described later.

FIG. 8 is a flowchart showing a battery check routine. The battery check circuit (120) has two judgment levels, and the output voltage Vd of the main power battery (100)
The battery check signal is sent to the control CPU (200) by comparing the two levels with d ₀ . Of these two determination levels, the higher determination level is the battery consumption warning determination level, and the lower determination level is the determination level as to whether or not the camera operation needs to be locked. Then, when the output voltage Vdd ₀ of the battery (100) crosses any of the determination levels, a pulse signal is sent from the battery check circuit (120) to the external interrupt terminal of the control CPU (200). Then, simultaneously with the output of this pulse signal, the determination result at that time is transmitted in parallel to the control CPU (200).

In FIG. 8, when an external interrupt from the battery check circuit (120) occurs in the control CPU (200), first, step C
At 300, check whether the main power battery (100) is extremely exhausted, and if you need to lock the operation of the camera, go to step C310 to initialize all ports and stop the operation of the camera. Step C3
At 12, the power supply voltage Vcc is turned off. Next, in step C314, lock display information is set in the serial register (b ₂₁ = 1, b
₂₀ = 0), and serial data is transmitted to the display circuit (500) in step C316. (And, as will be described later, the display circuit (500) receives this signal and turns off the display altogether). Next, in step C318, the frame count value (b ₅₅ to b) of the serial register currently held by the memory IC (280).
_After writing ₅₀ ), enter the standby state.

On the other hand, if it is determined in step C300 that the locked state has not been reached, the process proceeds to step C302, and step C3
In 02, the battery consumption warning display information is set in the serial register (b ₂₁ = 1, b ₂₀ = 0), and in step C304, the display circuit (50
Send serial data to 0) and return. As described above, since the information of the main power source battery (100) is interrupted, the information is immediately transmitted to the display circuit (500) regardless of any other processing.
At the time when the locked state is caused by the exhaustion of the battery, the frame count value at that time is set to the memory IC (28
Since it is written in 0), even when the main power battery (100) is replaced, the frame count value counted so far is not lost.

Note that the user may immediately replace the battery when the battery exhaustion warning is issued.
The frame count value may be written in (280). Further, it may be written in the memory IC (280) each time the frame count value is incremented.

FIG. 9 shows the control CPU (2
It is a flowchart which shows the detail of the key scanning subroutine "SUB-C1" of (00). In FIG. 9, step CS100
Check the status of the switch (SW iso) linked to the ISO key (803) with. If the ISO key (803) is not pressed, move to step CS102 and execute the ISO display command (b ₃₇ ) in the serial register. After clearing, in step CS104 the state of the switch (SW mod) linked with the shooting mode key (804) is checked. When the shooting mode key (804) is being pressed, it means that the exposure control mode is to be changed. Therefore, proceed to step CS110 to refer to the exposure control mode currently set and set the current mode to the program mode. In some cases, it is reset to the manual mode in step CS112, and the process goes to step CS120. When the current mode is the manual mode, it is reset to the program mode in step CS114 and skips to step CS150.

On the other hand, when the shooting mode key (804) is not pressed in step CS104, the currently set shooting mode is referred to in step CS106, and when the current exposure control mode is the program mode, proceed to step CS150, In manual mode, proceed to step CS120. That is, if the finally set mode is the program mode, proceed to step CS150, and if it is the manual mode, step to set the shutter speed and aperture value.
We proceed to CS120.

Up / down key A (805) (806) in step CS120
Check the status of the switch (SW ua) (SW da) that is linked to, and if either is pressed, increment or decrement the shutter speed value (Tv value) in step CS122 or step CS124 to perform the corresponding processing. To do. Then, the process proceeds to step CS130, and the switch (SW u
b) The state of (SW db) is checked, and if either is pressed, the corresponding value is incremented or decremented in step CS132 or step C134 and the corresponding processing is performed, and the flow proceeds to step CS150.

On the other hand, if it is determined in step CS100 that the ISO key (803) has been pressed, go to step CS140 and set the ISO display command (b ₃₇ ) in the serial register, then in step CS142 press the up / down key. A (805) (80
Check the status of the switches (SW ua) and (SW da) linked to 6), and if either is pressed, step CS14
In step 4 or step CS146, the film sensitivity value (Sv value) is incremented or decremented to perform the corresponding processing, and the process jumps to step CS150. Then, after the contents of the serial register are transmitted to the display circuit (500) in step CS150, the process returns to the original flow.

As described above, step CS150 is executed while the contents of the serial register are updated with the latest information scanned in this subroutine "SUB-C1", and the control CPU (200) transfers to the display circuit (500). That is, serial data is transmitted.

FIG. 10 shows the control CPU shown in step C256 of FIG.
Is a flowchart of film subroutine showing the details of the winding operation "SUB-C2""of (200). In FIG. 10, the first motor M ₁ (241) at step CS200 that during the shutter release is rotated in the reverse direction The film winding is started, the serial register is set to the winding state (b ₄₁ = 0, b ₄₀ = 1) in step C202, and the serial data is transmitted to the display circuit (500), and then the control CPU (200 ), A timer incorporated in () is set for a fixed time (for example, 1.5 seconds) to start this timer, and in step CS210, the state of a switch (not shown) for detecting the completion of film winding is checked.

Here, until the completion of film winding is detected, the contents of the timer started in step CS204 are checked in step CS212, and when the time is not up, the loop of steps CS210 to CS212 to CS210 is run. .

Then, when the film winding is completed, it is detected in step CS210, and escapes to step CS220 and the motor
Stop the rotation of M ₁ (241). Next, in step CS221, the state of the film detection switch (SW sls) is checked to determine whether the film is wound normally. If the film is wound normally, go to step CS222 and proceed to the serial register. incrementing a frame count value (b ₅₅ ~b _50). Step CS
When the film is not wound at 221 (when the film is not loaded or when the film loading fails for some reason), the process branches to step CS223, and the frame count value (b ₅₅ ~
b ₅₀ ) is cleared to zero and merges into step CS224. In step CS224, the winding end state is set in the serial register (b ₄₁ = 0, b ₄₀ = 0), serial data is transmitted to the display circuit (500) in step CS226, and the process returns.

On the other hand, when the time is up in step CS212 before the completion of film winding is detected in step CS210,
That is, when the film winding is not completed within the fixed time, the process goes out from step CS212 to step CS230. This state is a state in which the film is taut during the winding of the last frame after all the shooting frames have been shot. In this case, stop the rotation of the motor M ₁ (241) in step CS230, set the information indicating that the film is taut in the serial register (b ₄₁ = 1, b ₄₀ = 1) in step CS232, and display it. Serial data is transmitted to the circuit (500), the shutter release operation is prohibited in step CS234, and the power supply voltage Vcc is set to O in step 236.
Set to FF and enter the standby state.

FIG. 11 shows a detailed operation flowchart of the rewinding control subroutine "SUB-C3" in step C290 of FIG. When the switch (SW rew) shown in FIG. 3 is turned on by the operation of the rewind switch (811) shown in FIG. 1, the control CPU (200) is interrupted, and the subroutine “SUB-C3” shown in FIG. "Is executed. First, check the state of the film detection switch (SW sls) in step CS300,
When this switch (SW sls) is ON (when film is not loaded), it returns immediately because there is no need to rewind, and when switch (SW sls) is OFF (when film is loaded) ) Proceeds to step CS302 to enter the rewinding operation.

In this rewinding operation, so as not to ON motor M ₁ and (241) the motor M ₂ (242) and at the same time, it leaves first stops the rotation of the motor M ₁ (241) at step CS302, step In order to inform the display circuit (500) that the rewinding operation has been started in C304, the serial register is set to the rewinding state (b ₄₁ = 1, b ₄₀ = 0) and the serial data is transmitted. In step CS306, the rewinding motor M ₂ (242) is energized to start rewinding. While this rewinding operation is in progress, the state of the film detection switch (SW sls) is checked in step CS308, and as long as this switch (SW sls) is OFF, the loop of step CS308 is continued.

And when the film finally comes off the spool axis,
Since the film detection switch (SW sls) is turned on, go to step CS310 and check the switch (SW iso) linked to the ISO key (803). Where ISO key (80
If 3) is not operated and the switch (SW iso) is OFF, in step CS312 the film reader section has enough time to be completely caught in the cartridge (eg, 5).
Second), and then rewind motor M ₂ (2
42) Stop rotation. On the other hand, if the ISO key is pressed and the switch (SW iso) is ON in step CS310, step CS312 immediately proceeds to step CS314 without waiting for a certain period of time to rotate the motor M ₂ (242). Stop.

Then, after stopping the rotation of the motor M ₂ (242) in step CS314, the serial register is rewritten (b ₄₁ = 0, in order to notify the display circuit (500) that the rewinding operation is completed in step CS316. b ₄₀ = 0) to perform serial data transmission, and then return.

Here, the branch based on the determination of the state of the ISO key (803) in step CS310 is free for the photographer to either wind the film leader into the cartridge or leave it at the end of rewinding. It is designed so that it can be selected. In other words, if you want to leave the film leader outside the cartridge, press the ISO key (803) when rewinding the film (when the film detection switch (SW sls) is switched from OFF to ON). , If you want to wrap the film leader in the cartridge, rewind without pressing the ISO key (803). Here, in the present embodiment, the ISO key (803) is used to specify whether or not the film reader section is to be wound into the patrone. However, the present invention is not limited to this. Any member such as the key (804) or other operation switch that is not normally operated during the rewinding operation may be used. Also, in this embodiment, the ISO key (803) is pressed when the film leader section is desired to be left, but conversely, when the film leader section is desired to be wrapped in the patrone, the ISO key (803) is pressed. It goes without saying that you may do so.

FIG. 12 shows a flowchart of the operation of the subroutine "SUB-C4" for automatic loading control (initial loading) at the time of loading a film, which is shown in step C280 in FIG.
In FIG. 12, first, in step CS402, the DX code of the film loaded in the camera is read from the DX contact (250), and in step CS404 it is converted to ISO value data, and this ISO value data is stored in the serial register (b ₃₆ ~ B ₃₀ ).
Then, the ISO display command bit of the serial register is set (b ₃₇ = 1) at step CS406, perform serial data transmission to the display circuit in step CS408 (500). Thereby, as will be described later, the display circuit (500) forcibly displays the ISO value during the initial loading operation period.

Next, in step CS410, the number of frames fed during initial loading (4 frames) is set in the soft counter, and in step CS412 the forward rotation of the release motor M ₁ (241) is started until the raising of the main mirror is completed. Wait at step CS414. When the raising completion detection switch (not shown) of the main mirror is activated in step CS414, the rotation of the motor M ₁ (241) is stopped in step CS416, a slight waiting time (for example, 30 msec) is taken in step CS418, and then step CS420
Then, the film is initially wound by the winding subroutine "SUB-C2" shown in FIG. Note that step CS418
The reason why the waiting time is taken is to reduce the load on the power supply system due to the back electromotive force by providing a stop time at the switching from the normal rotation to the reverse rotation of the motor M ₁ (241).

Then, in steps CS422 and CS424, the contents of the soft counter are decremented to determine whether or not it becomes zero. If the result is not zero, the process returns to step CS412,
If it is zero, proceed to step CS246. That is, when the film is initially wound, the operations of steps CS412 to CS424 are repeated four times. When the film feed operation by the count release operation is completed, the state of the film detection switch (SW sls) is checked in step CS426, and if this switch (SW sls) is OFF , the frame count value of the serial register at step CS428 a _{(b 55 ~b 50) "000001} "
Preset the (binary), switch if (SW sls) is ON i.e. film has not been loaded properly, the frame count value in step CS430 (b ₅₅ ~b ₅₀₎
Is cleared to zero (“000000”).

Then, the ISO display command b ₃₇ of the serial register is cleared at step CS432, and transmits the serial data display to a circuit (500) at step CS434, the process returns. Therefore, during initial loading, the display (60
In (0), the sensitivity value (ISO value) of the loaded film is automatically read and displayed, and when the initial loading is finished, this ISO value display is canceled and switched to the frame count value. At this time, if the frame count value is "1", it means that the film is loaded correctly. If the frame count value is "0", there is no film or the initial loading does not work properly and the film is wound. Indicates that it has not risen.

Next, the operation of the display circuit (500) will be described. First, Table 2 shows the configuration of the liquid crystal driving data storage register (display RAM) of the display circuit (500).

Here, in Table 2, (1a)-(1g), (2a)-
(2g), ... (8a) to (8g) indicate each segment in the numerical display of 7 segments, and the positions of the segments (a) to (g) are as shown in FIG.

In the present embodiment, the display circuit (500) is composed of a 4-bit microcomputer, and the drive system of the liquid crystal forming the display units (600) (700) is 1/4 duty, 1/3 bias system. There is. And each bit (b ₀ ) in Table 2
The drive signals corresponding to (b ₁ ) (b ₂ ) (b ₃ ) are the common terminals (COM ₀ ) (COM ₁ ) (COM ₁ ) (COM ₁ ) (COM ₁ ) (COM ₁ ) forming the common data bus (COM) of the display circuit (500) shown in FIG. The drive signals respectively output from COM ₂ ) and (COM ₃ ) and corresponding to the display RAM addresses (d ₀ ) to (d ₁₈ ) of the display circuit (500) are connected to the segment terminals (SEG) that constitute the segment data bus (SEG). S ₁ ) ~ (S
₂₁ ) respectively. The matrix of the signals from the common terminals and the signals from the segment terminals is used to display the display portion (600) shown in FIGS. 4 and 5.
And (700) are displayed.

14 to 26 are flowcharts of programs showing the operation of the display circuit (500). FIG. 14 shows a power-on reset routine which is an operation when the power battery is attached to the camera. When power is supplied to the camera, the program counter is reset by hardware, and the display circuit (500) starts execution from this routine shown in FIG. First, in step D02, each port of the display circuit (500) including the microcomputer is set to a predetermined initial condition, and in steps D04 and D06, the initial settings of the stack and the RAM are executed. Then, in step D08, the subroutine "SUB-D1" is executed. This subroutine is a program for checking the operation of the display unit (600) (700) consisting of a liquid crystal display device, and displays all the segments of the display unit (600) (700) at the same time only when a special operation is performed. In case of, it returns without displaying all,
Details of the operation will be described later with reference to FIG.

When this subroutine ends in step D08, step D
Proceed to 10 to clear various interrupt flags (external interrupt flag, timer interrupt flag, serial interrupt flag, etc.) described later. Next, in step D12, a constant that gives 250 msec to the timer built in the display circuit (500) is set, and then the timer is started in step D14. Then, in steps D16 and D18, the external interrupt (EXT.INT.) And the timer interrupt (TIMERINT.) Are accepted, and then the system clock is stopped in step D20 to enter the standby (stop) state. Here, the display circuit (500)
When the system enters the standby state in the interrupt enabled state, it is possible to return from the standby state to the normal state by the generation of an interrupt request and perform the interrupt processing. Furthermore, the oscillator circuit (503) continues to oscillate even after entering the standby mode in step D20, and its clock is input to the built-in timer. Therefore, when 250 msec elapses after executing step D18,
An interrupt request is generated from the timer built in the display circuit (500), and the display circuit (500) exits the standby state and performs the timer interrupt routine.

Although details of this timer interrupt processing routine will be described later, the display circuit (500) periodically (250 ms
Every ec), the processing can be performed after leaving the standby state. Also, when an interrupt request is generated by a signal from the outside in the standby state, it is possible to similarly exit the standby state and perform a process corresponding to the interrupt request.

FIG. 15 shows a flowchart of the subroutine "SUB-D1" shown in step D08 for displaying all the segments of the display units (600) (700). When jumping to this subroutine in step D08 of the power-on reset routine shown in FIG. 14, first, in step DS100, the state of the switch (SW m) linked to the main switch (800) is read from the port, and this switch (SW m) If the input port (PORT) of the connected display circuit (500) is "Low", the main switch (800) is in the "ON" position and the switch (SW m) is ON, so jump to step DS130. Then do nothing and return. On the other hand, if the input port (PORT) of the display circuit (500) is "High", the main switch (800) is in the "LOCK" position and the switch (SW m) is OFF, so go to step DS102. After setting the constant corresponding to 500 msec in the built-in timer, disable external interrupt (EXT.INT.) In step DS103, and then again in main switch (80
The status of the switch (SW m) linked to
ORT) to read and judge the state.

If this input port is "High", that is, if the main switch (800) is OFF, the process proceeds to step DS106 to determine whether or not the built-in timer has finished counting the time of 500 msec. If not, the process returns to step DS104, If the time has been completed, proceed to step DS120 and execute the external interrupt (EXT.IN
Allow T.) to jump to step DS130 and return. In step DS104, the input port (PORT) is "Lo
w ”, that is, if the switch (SW m) linked to the main switch (800) is ON, skip to step DS110 and display RAM
Address (d ₁ ) to (d ₂₁ ) of the
After turning on all the segments of 00) and (700), disable all interrupts in step DS112.

Next, in step DS114, the state of the switch (SW m) linked to the main switch (800) is checked, and as long as this switch (SW m) is ON, it goes around the loop of step DS114 and this switch (SW m) is OFF. If so, go to step DS116 and display all addresses in display RAM (d ₁ ) ~
Clear all (d ₂₁ ), turn off all segments of the display (600) and (700), and in step DS120, enter an external interrupt (E
XT.INT.) And return.

That is, to summarize the operation of the subroutine shown in FIG. 15, the switch (SW m) linked to the main switch (800) is turned off at the entrance to this subroutine, and the main switch (800 m ), The display (600) (700) is fully lit only when this switch (SW m) is switched from OFF to ON.
In other cases, no special operation is performed and the process returns. Then, when all the lights of the display parts (600) (700) are executed, the main switch (800) is operated again and the switch (S
By returning W m) from ON to OFF again, all the display is extinguished and the process returns to return to the normal processing routine.

Next, Table 3 shows the contents of the blink flag register. Here, the blink flag register is a collection of flags related to the blinking display operation of each display element of the display units (600) (700). The blinking display is not performed only when the contents of this register are all "0", and the blinking display process is performed when the flag is set even for one bit. That is, when the content of the blink flag register is not "0", the routine jumps to the routine for blink display processing, and the display element corresponding to the set flag blinks according to the content of the blink counter described later. .

As will be described later, in the program of the display circuit (500) of this embodiment, a timer interrupt occurs every 250 msec, and a blink counter composed of 2 bits is incremented in the interrupt routine. Therefore, the lower bit of this blink counter is 2H
It changes with z, and the high-order bit changes with 1Hz. Therefore,
By referring to the blink counter in the blinking display processing routine to be described later, the blinking period of the display element can be arbitrarily controlled between 2 Hz and 1 Hz according to the type of flag.

Next, each bit of the blink flag register shown in Table 3 will be described. First, (F0) is a flag that is set when the film is not loaded correctly in the camera. Refer to the flag (F0) for the film loading warning display (“LOAD FILM”, that is, the display element (611) (612) Blinking is performed (F1) is a flag that is set when all frames of the film have been shot. Refer to this flag (F1) for the film end warning display (“FILM END”, that is, the display element (612) ( 613) flashes). Furthermore,
(F2) is a flag that is set when the rewinding of the film is completed. With reference to this flag (F2), a warning message (flashing of the Patrone mark (621)) for film removal is displayed. (F4) is a flag that is set when the battery check circuit (120) detects a drop in the power supply voltage. With reference to this flag (F4), the battery exhaustion warning (battery marks (615) and (733) Flashes).

Next, FIG. 16 shows a flowchart of the timer interrupt processing routine. This timer delay occurs every 250 msec. When a timer interrupt occurs, the display circuit (500) saves the contents of the accumulator and the working register in step D100, and then increments the blink counter consisting of 2 bits in step D102. Next, in step D104, the state of the main switch (800) is checked, and if the switch (SW m) interlocking with the main switch (800) is OFF, step D10
6 Proceed to Step D, and if it is ON, jump to Step D120.

If the main switch is OFF, the frame count value of the serial data in step D106 check the value of the frame count by (b ₅₅ ~b _50), which calls the subroutine "SUB-D5" in step D110 when not zero The frame count value is displayed on the display section (600) and the bit (b ₂ ) (b ₀ ) and the address (d ₇ ) bit (b ₂ ) of the display RAM address (d ₆ ) are displayed in step D112. By setting the display element (612) and the "FIL
The letter "M" is displayed and the Patrone mark (62
1) Display a picture of the film set mark (624).

If the frame count value is zero in step D106 of FIG. 16, the display RAM address (d ₀ ) to
(D ₁₈ ) is cleared and all displays are erased. Then
Blink flag register flag (F4) in step D114
After clearing, enter the standby state. Here, the timer built in the display circuit (500) is operating even in the standby state, and a timer interrupt occurs again after 250 msec.

If it is determined in step D104 that the main switch (SW m) is ON, the blink flag register is checked in step D120. If it is zero, blinking display processing is not necessary, so jump to step D140 to jump to accumulator and Restores the contents of the working register and returns.
If the contents of the blink flag register are not all zero in step D120, step D122 for blink display processing,
Proceed to D126, and sequentially execute the subroutine "SUB-D91""SUB-
D8 "is called and the process proceeds to step D140. That is, in the subroutines" SUB-D91 "and" SUB-D8 ", the related display segments are turned ON / OFF according to the contents of the blink counter as described later. Since it is programmed, all display elements that require blinking display are in step D122.
It is designed so that blinking is controlled appropriately with ~ D126.

FIG. 17 shows the external interrupt processing routine of the display circuit (500). Control CPU (200) is the display circuit selection signal (CSDSP)
Is changed from “High” to “Low”, the display circuit (5
When an external interrupt request is generated at 00) and the display circuit (500) is in the external interrupt enable state, the processing of this routine shown in FIG. 17 is started. Even when the display circuit (500) is in the standby state, this external interrupt activates the display circuit (500) to execute this routine.

In this embodiment, a serial flag (not shown) provided in the display circuit (500) is set every time 1 byte (8 bits) of serial data is sent from the control CPU (200) to the display circuit (500). The display circuit (50
0) can check or clear this serial flag by software, and it becomes possible to detect whether or not the transfer of 1 byte is completed by detecting the state of this serial flag. There is. The display circuit (500) is provided with a 3-bit counter (not shown) for counting bits of this serial data. The 3-bit counter counts one byte of serial data and sets a serial flag. It is supposed to do. This 3-bit counter can be cleared by software.

In FIG. 17, when an external interrupt occurs, the display (500) first saves the contents of the accumulator and the working register in step D200, and then calls the subroutine "SUB-D6" described later in step D202 to control CPU. Execute the process of importing the serial data sent from (200). Then, in step D204, the serial end flag is checked. Here, this serial end flag is a flag that is set or cleared in the subroutine "SUB-D6" which will be described later. It is set to "1" when serial data can be completely received, and cannot be received completely. Is a flag that is cleared to "0".

Then, in step D204, the state of the serial end flag is determined, and if this flag is "0", the step
Jump to D240, restore the contents of the accumulator and working register, and return. That is, this corresponds to the case where new information cannot be received as serial data even if an external interrupt occurs, and therefore there is no work to be processed in this routine.

On the other hand, if the serial end flag is "1" in step D204, the process proceeds to step D210 to call a subroutine "SUB-D9" described later to display the battery check result based on the new serial data. After calling a subroutine "SUB-D5" which will be described later in D212 to display the frame count value, in step D214 the state of the main switch (SW m) is checked. If the main switch (SW m) is OFF in step D214,
Just by displaying the battery check result and the frame count value in steps D210 and D212, the process jumps to step D240 to restore the contents of the accumulator and the working register and return. On the other hand, if the main switch (SW m) is ON, proceed to Step D216 and serial data bit (b ₃₇ )
Is checked, and if b ₃₇ = 1, it means the ISO value display mode, so jump to step D230 and execute the subroutine "SU" which will be described later.
To display the ISO value by calling the B-D4 ", if b ₃₇ = 0 in the return to. Step D216 jumps to step D240,
Move to step D220 and execute subroutine "SUB-D2" which will be described later.
The shooting mode is displayed by, and the aperture value (Av value) and the shutter speed value (Tv value) are displayed by a subroutine "SUB-D3" which will be described later in step D222.
Then, a subroutine "SUB-D7" which will be described later is used to display the film feeding state, and then the process jumps to step D240 to return.

FIG. 18 shows a flowchart of the subroutine "SUB-D2" for displaying the exposure control mode shown at step D220 in FIG. In Fig. 18, first, in step DS200, control CPU
Bit of serial data sent from (200) (b ₄₇ )
To determine the exposure control mode, jump to step DS202 in the program mode (P mode), and jump to step DS210 in the manual mode (M mode). Then, if the program mode, in step DS202, elaborate write bit (b _3), respectively, and (b ₂₎ 0, 1 address of the display RAM (d _8), for displaying the program mode. Here, the segment data bus (SEG) that transmits the output signal from the address (d ₈ ) of the display RAM is parallel to the display unit (600) on the camera body (1) and the display unit (700) in the viewfinder. Since it is wired to, both display units (600) (700) simultaneously display the program mode. Next, display R in step DS204
Indicator (732) (731) for metered manual display by clearing bit (b ₃ ) of address (d ₉ ) and bit (b ₃ ) of address (d ₁₅ ) of AM respectively
Erase and return.

On the other hand, when it is determined that the manual mode in step DS200, performing the display of the manual mode indicator bit (b ₃₎ of the RAM address (d ₈₎ (b ₂₎ respectively elaborate write 1,0 in step DS210 Then step DS212 ~ DS2
Use 22 to display the metered manual index. That is, in step DS212, the serial data bit (b ₁₁ )
Is checked, and if b ₁₁ = 1, display RAM in step DS214
The bit (b ₃ ) of the address (d ₁₅ ) of is reset to “1” to display the mark (731). On the contrary, if b ₁₁ = 0, in step DS216, the bit (b ₁₅ ) of the display RAM address (d ₁₅ ) ( b ₃ ) is reset to erase the mark (731), then step DS2
Check bit (b ₁₀ ) of serial data at 18 and check b ₁₀
= Each bit of 1, then the display RAM address (d ₉₎ (b ₃₎
Is set to display the mark (732). Conversely, if b ₁₀ = 0, the bit (b ₃ ) of the display RAM address (d ₉ ) is cleared to erase the mark (732), and the process returns.

Next, FIG. 19 shows a flowchart of the subroutine "SUB-D3" for displaying the aperture value (Av value) and the shutter speed value (Tv value) shown in step D222 in FIG. In Figure 19, first takes in the signals of bits of the data indicating the aperture value from the serial data register (Av value) in step DS300 (b ₁₇ ~b ₁₂₎ to the accumulator, the data converted into the corresponding F value in step DS302 Then, the F value obtained in step DS304 is converted into segment data for display. Furthermore, step DS306
To display the segment data at the corresponding address in the display RAM (d
₁₅ ) to (d ₁₆ ) (see Table 2)
The F value is displayed on the display unit (700).

Next, at step DS310, the data bit (b) indicating the shutter speed value (Tv value) is read from the serial data register.
₂₇ ) to (b ₂₂ ) are taken into the accumulator and step D
The Tv value data fetched in S316 is converted into a shutter speed value, and the shutter speed value obtained in step DS318 is further converted into corresponding segment data. Then, the display returns the shutter speed value on the display unit (700) by transferring the corresponding address of the display RAM segment data in step _{DS320 (d 9) ~ (d} 14) ( see second votes).

Furthermore, FIG. 20 shows the ISO shown in step DS230 of FIG.
The flowchart of the value display subroutine "SUB-D4" is shown. In FIG. 20, first, the bit serial data in step _{DS400 (b 36) ~ (b} 30) from the film sensitivity value (Sv
Value), the data is converted into an ISO value corresponding to the Sv value in step DS402, and then in step DS404 the ISO value is converted into segment data to be displayed on the display unit (600). Next, in step DS406, all the display RAM addresses (d ₀ ) to (d ₁₈ ) are cleared to completely erase the display on the display section (600), and then in step DS408, the segment relating to the film sensitivity obtained earlier. display unit by transferring data to the display RAM address _{(d 9) ~ (d 14} ) (6
00) Display ISO value on top and return.

Next, FIG. 21 shows a flowchart of the frame count value display subroutine "SUB-D5" shown in step DS212 of FIG. In Fig. 21, first, step DS50
At 0, obtain the frame count value as binary data from the serial data bits (b ₅₅ ) to (b ₅₀ ) and step
The DS502 determines if the data is zero. If this frame count value is not zero in step DS502, proceed to step DS504 to clear the flag (F0) of the blink flag register, convert the frame count value that is binary data to decimal in step DS506, and then execute step DS508. Convert to segment data for display on the display (600). Then step DS510
Segment data in from as characters bit display RAM address (d ₆₎ (b ₂₎ by clearing with bits (b ₃₎ sets the "LOAD" does not appear, the frame count value in step DS512 To the display RAM address (d ₉ ) to (d ₁₂ ) to display (600)
The frame count value is displayed above and the process returns.

On the other hand, when it is determined that the frame count value is zero in step DS502, it is considered that the film is not loaded or the initial loading of the film is not normally performed for some reason. Branch to set the flag (F0) of the blink flag register and refer to the lower bit of the blink counter in step DS522
The display or deletion of the "LOAD FILM" character is controlled by DS524 or step DS526, and the process returns.

Further, FIG. 22 shows a flowchart of the subroutine "SUB-D6" for fetching serial data shown in step D202 of FIG. First, at the entry step DS600 of this subroutine, the timer interrupt is disabled. This is to prioritize the serial data processing over the timer interrupt processing. If a timer interrupt request occurs during serial data processing, hold that request and wait for the timer The interrupt prohibition is released and the held timer interrupt process is performed.

Next, in step DS602, the display circuit selection signal (CSD) input to the external interrupt terminal (INT) of the display circuit (500) is input.
The status of SP) is determined by software. If the display circuit selection signal (CSDSP) is "High", it means that serial communication is not normally performed.
After jumping to DS626 and clearing the serial end flag, go to step DS640 to release the prohibition of timer interrupt and return. On the other hand, if it is determined in step DS602 that the display circuit selection signal (CSDSP) is "Low", it is determined that the serial data communication is normal, and the process proceeds to step DS610.

And, the control CP from step DS610 to step DS638
It is a processing routine for reading the serial data transmitted from the U (200) to the display circuit (500). First,
In step DS610, it waits for serial data to be sent, so the serial flag is cleared, and in step DS612, a 3-bit counter (not shown) for counting 1 byte (8 bits) of serial data is set. At the same time as clearing, at step DS614, the head address of the RAM for storing the serial data (in this example, referred to as "m") is set to the address pointer of the RAM to prepare a system for receiving the serial data. Next, in step DS616, set the software timer to, for example, "5ms.
After setting the data corresponding to ec ", move to step DS618 to check whether the serial flag is set. If the serial flag is not set in step DS618, move to step DS620 to display circuit selection signal ( SCDSP) again, and
In step DS620, the display circuit selection signal (CSDSP) becomes "L".
If it remains "ow", it is judged that the serial data transmission state is continuing and it proceeds to step DS622 and step D622.
In S616, the value of the software timer preset to "5msec" is decremented, and in step DS624 the contents of the software timer are judged. If the contents of this software timer are not zero, the process goes to step DS618 and becomes zero. If so, jump to step DS626.

If it is determined in step DS620 that the display circuit selection signal (CSDSP) is "High", the process jumps to step DS626 to clear the serial end flag and then to step DS620.
At 640, cancel the prohibition of timer interrupt and return. That is, although the display circuit selection signal (CSDSP) notifies the display circuit (500) of the transfer of serial data, it seems that the transfer of all serial data was not completed for some reason and the transmission was interrupted halfway. If the display circuit select signal (CSDS
P) becomes "High", so the display circuit (500)
Judges it in step DS620 and returns. In addition, although the display circuit (500) is notified of the serial data transfer by the display circuit selection signal (CSDSP), it remains for a certain period of time (“5m
If the serial flag is not set within sec "), the serial data transfer is regarded as invalid and returns.

On the other hand, when the normal serial data transfer is performed, the program of the display circuit (500) is executed by steps DS600 to DS618,
It goes around the loop to return to DS618 via DS620 and DS624, but when one byte (8 bits) of serial data is sent and the Sirral flag is set, step
The process jumps from DS618 to step DS630 and shifts to serial data import processing. First, in step DS630, the serial data sent to the serial data register is fetched into the accumulator and stored in the address pointed to by the RAM address pointer, and then in step DS632 the 3-bit counter for counting serial bits is cleared. Then, in step DS634, the content of the RAM address pointer is incremented. Then step
The content of the address pointer of this RAM is checked by the DS636, and if it is not a predetermined numerical value ("m + 5" in this example), the process returns to step DS616 to wait for the next serial data sent. If the content of the address pointer of this RAM is a predetermined numerical value ("m + 5") in step DS636, the process jumps to step DS638. That is, in the program of the display circuit (500) of this embodiment, steps DS618 and DS63 are executed by sending a series of serial data.
When the loop of 0, DS636, DS618 is rotated 5 times, step DS638
This will result in exiting, and the serial data acquisition will be completed. Then, after setting the serial end flag in step DS638, the prohibition of the timer interrupt is released in step DS640 and the process returns.

FIG. 23 shows a flow chart of the subroutine "SUB-D7" for displaying the film winding / rewinding relationship (drive display) shown in step D224 of FIG. First, to determine whether the film end state by step DS700 serial data bits _{(b 41) (b 42)} , branches if filming end state _{(b 41 = 1, b 40} = 1) to step DS730 . If it is not the film end state, go to step DS702 to clear the flag (F1) of the blink flag register, and in step DS704, determine whether clear winding is in progress by the serial data bits (b ₄₁ ) (b ₄₀ ). If it is winding, branch to step DS740. On the other hand, if the film is not being wound, step DS70
The bit (b ₀ ) of the display RAM address (d ₇ ) is cleared at 6 to erase the display element (623) indicating film winding, and the serial data bit (b ₄₁ ) is cleared at step DS708.
It is judged by (b ₄₀ ) whether or not the film is rewound, and if the film is rewound (b ₄₁ = 1, b ₄₀ = 0), the step
Branch to the DS750. When the film is not rewinding,
In step DS710, set the flag (F
With reference to 2), if this flag (F2) is "1", that is, immediately after the end of the rewinding operation (details will be described later), the process branches to step DS770. Conversely, flag (F2) in step DS710
If is 0, that is, in none of the above cases, the process proceeds to step DS780 to clear the flags (F2) and (F3) of the blink flag register to "0" and proceeds to step DS790.

If it is determined in step DS700 that the film has ended (b ₄₁ = 1, b ₄₀ = 1), in step DS730 the blink flag register flag (F1) is set to "1" and the flag (F0) is set to "0". ", And jump to step DS780. Also, during film winding in step DS704 (b ₄₁ =
If it is determined that 0, b ₄₀ = 1), step DS740
By setting the bit (b ₀ ) of the address (d ₇ ) of the display RAM, the display element (632) indicating that the film is being wound is displayed, and the process jumps to step DS780.

Furthermore, the film is being rewound in step DS708 (b ₄₁ = 1, b
_If it is determined that ₄₀ = 0), the flag (F2) of the blink flag register is checked in step DS750. This flag (F2) is set at the start of the rewinding display of the film and reset at the end of the rewinding display. Therefore, this flag (F
If 2) is "0", it means that the film is being rewound for the first time, so the process proceeds to step DS752 to perform rewind display start processing. First, in step DS752, the above-mentioned flag (F
Set 2) to "1", clear all the display RAM addresses in step DS754, and perform the rewind initial display in step DS756. Here, the initial rewind display is the display RAM
By setting all the bits (b ₀ ) of the addresses (d ₁ ) (d ₃ ) (d ₅ ) (d ₇ ) (d ₉ ) of, the cartridge mark (653) and the display elements (654) to (654) 657), a rewind bar graph display and a rewind mark (652) are displayed on the display unit (600).

Then, the frame count value when "N" (the data bit of the serial data _{(b 55) ~ (b 50} )) based on at step DS758, N1 = (N × P + α) × (1/4) ( However, N1 is rounded to an integer.) In step DS760, set the obtained numerical value 1N in the event counter, and in step DS762, set (ND) to "3" and set it to step DS79.
Jump to 0.

Here, in the calculation of step 758, P represents the number of pulses corresponding to one frame of film generated by the ON / OFF operation of the switch (SW sp) in the film rewinding process, and α is the film. Is the number of pulses corresponding to the length of the leader section of the. Therefore, N × P + α is the total number of pulses due to ON / OFF of the switch (SW sp) that is predicted to occur during the entire film rewinding process, and the numerical value N1 obtained in step DS760 corresponds to 1/4 of that. .

On the other hand, when the flag (F2) is “1” in step DS750,
Since the rewind display has already started, step
Jump to DS790 and blink the rewind mark (622). If the flag (F2) is "1" in step DS710, the film rewinding is not being performed and the film rewinding is being displayed, so the film rewinding is completed and the motor M ₂ (242) Since the rotation is stopped, the flag (F
2) is cleared to "0", the flag (F3) indicating the end of rewinding is set to "1", the process proceeds to step DS790, and the patrone mark (621) blinks.

After each of the above processing, step DS762, DS770, or DS
It flies from 780 to step DS790, but step DS790
Then, the subroutine "SUB-D8" controls the blinking of film winding / rewinding, and returns.

In the present embodiment, the bar graph showing the progress of the film rewinding is displayed by four bars as shown in steps DS758 to 762 and FIG. 25 described later.
It is not limited to this. Generally, if the number of bars in the bar graph is “n”, the calculation in step DS758 is N1 = (N × P + α) × (1 / n), and in step DS762, (N2) ← (n−1) Become.
The number of branches at step D404 of the event counter interrupt routine shown in FIG. 25, which will be described later, is (n-1).

As described above, the switch (SW sp) is opened and closed in conjunction with the rotation of the film rewind shaft in this example. Here, as the film is rewound, the film is wound on the rewind shaft, and the diameter thereof is gradually increased. Therefore, the number of frames per unit rotation amount of the rewind shaft is gradually increased. . Therefore, the number of frames during the film rewinding operation and the number of pulses generated from the switch (SW sp) are not strictly proportional. Therefore, by turning ON / OFF (SW sp), the frame count display cannot be accurately down-counted as the film rewinding progresses. However, according to the present embodiment, even in such a case, the progress of the film rewinding operation can be visually and intuitively displayed by using the graphic rewinding display by the bar graph as described above. it can. If the switch (SW sp) is configured to open and close in conjunction with a sprocket, etc., and the pulse generated by this switch (SW sp) has a strict one-to-one relationship with the film running. Needless to say, this example can be used.

Next, FIG. 24 shows a flowchart of a subroutine "SUB-D8" for controlling blinking of the film winding / rewinding related display shown in step D126 of FIG. 24th
In the figure, first, in step DS800, the flag (F1) of the blink flag register is checked. If this flag (F1) is "1", the process branches to step DS810 to display a film end warning. On the other hand, if the flag (F1) is "0", go to step DS802 to check the flag (F2), and if this flag (F2) is "1", perform step DS820 to display the film rewinding. Branch to. If the flag (F2) is “0”, go to step DS804 to check the flag (F3). If the flag (F3) is “1”, the step for displaying the film rewind end warning is displayed. Branch to DS830. If the flag (F3) is "0" in step DS804, go to step DS806 to check the flag (F0). If the flag (F0) is "1", the film loading warning is displayed. Step DS84
Branch to 0. On the other hand, if the flag (F0) is "0" in step DS806, all the flags in the blink flag register are all zero after all, so there is no need to display blinking related to film winding / rewinding and jump to step DS850. To do. On the other hand, the flag (F1) is "1" in step DS800.
When the bit (b ₃₎ of the address of the display RAM in step _{DS810 (d 8) (b 2} ) to erase both exposure control mode display and clear the reference to lower bits of blink counter in step DS812 Sets or clears the bits (b ₂ ) (b ₁ ) of the display RAM address (d ₆ ) in steps DS814 and DS816, and the display element (612) (613) turns on or off the character "FILM END". Let's step DS
Shamp to 850.

When the flag (F2) is "1" in the step DS802, bits of the address of the display RAM in step _{DS820 (d 8) (b 3} )
(B ₂ ) and bit (b ₃ ) (b ₂ ) (b ₁ ) of address (d ₆ )
Display control mode and each character of "LOAD", "FILM" and "END" are erased by clearing each. Set or clear the bit (b ₁ ) of the address (d ₇ ) of
Turn the rewind mark (622) on or off and jump to step DS850.

When the flag (F ₃₎ is "1" in the step DS804, by referring to the low-order bits of blink counter in step DS830, set bit (b ₂₎ of the display RAM address (d ₇₎ in step DS832 Alternatively, in step DS834, by clearing all the addresses in the display RAM, the patrone mark (621) is turned on or off to indicate rewind end, and the process jumps to step DS850. If the flag (F0) is "1" in step DS806, the lower bit of the blink counter is referred to in step DS840 to display the bit (b ₃ ) of the display RAM address (d ₆ ) in step DS842 or DS844. ) (B ₂ ) is set or cleared to turn on or off both the "LOAD" and "FILM" characters (the film count value is displayed at zero) and jump to step DS850. After each of the above processes, the subroutine "SUB-D91" (described later) for displaying the battery check is all executed in step DS850 in this subroutine, and the process returns.

FIG. 25 shows an event counter interrupt processing routine. In this embodiment, as described above, when the film is rewound, a pulse train corresponding to the film rewinding state is generated by the switch (SW sp) interlocking with the film rewinding mechanism, which is the event counter of the display circuit (500). It is designed to be input to the input terminal (EVENT CTR). Then, in step DS760 of the subroutine "SUB-D7" shown in FIG. 23, the numerical value (N
1) is down-counted by the pulse train input, and when the count of the numerical value (N1) is completed, an interrupt request is generated,
This routine shown in FIG. 25 will be executed.

In this routine, first, the contents of the accumulator and the working register are saved in step D400, then the previously set numerical value (N1) is set in the event counter in step D402, and then the value of the software counter ( Check N2). When the value (N2) of this software counter is "3", step
D406 displays three bars with display elements (654), (655), and (656), and when the software counter value (N2) is "2", in step D408 two display elements (654) (655) are used. Is displayed, and if the software counter value (N2) is "1", the display element (65
One bar is displayed by 4), and the process moves to step D412. Then, in step D412, the value (N2) of the software counter is decremented, and then in step D414, the values of the accumulator and the working register are restored and the process returns.

Further, FIG. 26 shows a flowchart of the subroutine "SUB-D9" for displaying the battery check shown in step D210 of FIG. In FIG. 26, first, step DS
Check the serial data bit (b ₂₀ ) at 900. If this bit (b ₂₀ ) is "1", the battery is exhausted, so branch to step DS916 and display RAM all addresses (d ₁ ). All of (-d ₂₁ ) are cleared to turn off all display (lock display), and the display circuit (500) enters the standby state. Also, if the bit of the serial data (b ₂₀₎ is "0" in the step DS900, since the camera function is not a locked state, whether the serial data bit is a battery low warning area proceeding to step DS902 ( Check with b ₂₁ ). Since the bit (b ₂₁₎ is "0", the battery is sufficient, clears the blink flag register flag (F4) proceeding to the battery DS904, address of the display RAM in step DS906 (d ₈ The battery mark (615) (733) is erased by clearing the bit (b ₁ ) of), and the process returns. On the other hand, if the serial data bit (b ₂₁ ) is “1” in step DS902, the flag (F
After setting 4), check the high-order bit of the blink counter in step DS912. If this high-order bit is "1", display the battery mark (615) (733) in step DS914 and set the high-order bit of the blink counter to " If it is 0 ", it jumps to step DS906, erases the battery marks (615) (733), and returns. Since the high-order bit of the blink counter is inverted at 1 Hz as described above, blinking of the battery marks (615) (733) is controlled at 1 Hz.

This subroutine "SUB-D9" also has another entrance in step DS912, and this entrance (subroutine "SUB-D9"
-D91 ") is used to control the blinking of the battery marks (615) (733). That is, as shown in Fig. 16, even when the display circuit (500) is in standby, the timer interrupt causes 250ms.
When it is activated every ec, the battery mark (6
15) The blinking display of (733) can be continued.

FIG. 27 will explain how the above-described flowcharts of FIGS. 6 to 26 are expressed on the display unit (600) on the camera body (1). First, if the main switch (820) is set to the "ON" position when no film is loaded in the camera, the display (60
In (0), as shown in FIG. 27 (a), the frame counter indicates "0" and the character "LOAD FILM" blinks to warn the photographer of film loading. Then, when film is loaded and the back cover of the camera is closed, the frame is automatically advanced for 4 frames (initial loading), and the film sensitivity is automatically read from the DX code recorded on the film cartridge. During the initial loading, the read film sensitivity value (ISO value) is displayed as shown in Fig. 27 (b), and when the initial loading is completed, the frame counter display becomes "1" as shown in Fig. 27. Together with the display element (612), the letters “FIL
M ", the patrone mark (621), and the film set mark (624) are lit. This display state is the standard display state when the normal camera is in the standby state.

Further, when the shutter is released, the winding mark is displayed by the display element (623) when the film is wound, as shown in FIG. 27 (d), and when the winding of one frame is completed, the winding mark is erased and the frame counter is displayed. Is incremented by "1". In addition, when all the frames of the loaded film have been taken and the film becomes tight during film winding, the display elements (612) and (613) display the "FILM" as shown in Fig. 27 (f).
The character "END" and the winding mark by the display element (623) are displayed blinking to request the film rewinding operation. When the rewinding switch (811) is operated and the switch (SW rew) is turned on, it is displayed. Part (600) display is second
As shown in Fig. 7 (g), the rewind mark by the display element (622) blinks and the display element (624)
4 bar graph displays by (627) appear, and the rewind remaining amount display starts. Then, as the film is rewound, each time about 1/4 of the entire process progresses, the four bar displays by the four display elements (624) to (627) are turned off one by one ( Figure 27 (h) ~
(J)) Finally, when the rewinding is completed, the motor M ₂ (24
2) is automatically stopped, and as shown in Fig. 27 (k), only the Patrone mark (621) is displayed as a blinking display.
The progress of rewinding is displayed intuitively.

When the back cover is closed without inserting the film, the initial loading operation is performed and the display section (600) shows the 27th
Although the display as shown in FIGS. (A) and (b) is performed, serial data transmission during initial loading (the subroutine shown in FIG. 10 executed at step CS420 in the subroutine “SUB-C4” shown in FIG. 12) is performed. Step CS in "SUB-C2"
226), the film count value is zero as a result of checking the state of the film detection switch (SW sls), so when the initial loading ends and the ISO value display is canceled, the display section (600) Is displayed second again
7 Return to the state shown in Fig. 7 (a) and issue a film loading warning. Further, even if the leader portion of the film is not properly wound around the take-up shaft when trying to load the film and the initial loading does not work normally, the display state is the same as that without the film.

By the way, the display part (600) (700) which consists of a liquid crystal display device
An example of the check mode in which all the display elements are simultaneously turned on has been described with reference to the flowcharts of FIGS. 14 and 15. Here, in the above embodiment, by operating the main switch (820) at a specific timing immediately after the main power supply battery (100) is attached to the camera, a mode in which all display elements are simultaneously turned on is entered. .
However, the timing to enter the mode in which all the display elements are turned on at the same time is not limited to the above-mentioned embodiment. You may enter.

Therefore, next, FIGS. 28 to 30 show flowcharts of other embodiments regarding the timing of entering the mode in which all the display elements are simultaneously turned on.

In this embodiment, when the initial loading is started immediately after the back cover of the camera is closed, the up / down key A.
If you press all B (805) (806) (807) (808),
This is a mode in which all display elements are turned on at the same time. In addition, when the main switch (82
This mode is exited by operating (0), and then a regular initial loading process is performed. Here, in this embodiment, since the control CPU (200) and the display circuit (500) operate in cooperation with each other, an instruction bit (b ₅₇ ) for executing a mode in which all display elements are simultaneously turned on as serial data is used. ) Is newly added, and this bit (b
_{When 57} ) is "1", the display circuit (500) instructs the display of all display elements, and conversely, when this bit ( _b57 ) is "0", the normal display operation is performed.

FIG. 28 is a modification of the initial loading control subroutine "SUB-C4" (shown in FIG. 12) of the control CPU (200). In this subroutine, first, at the entrance step CS400 of this subroutine, the switches (SW ua) (SW da) (SW ub) (SW db) linked to all the up / down keys A / B (805) to (808) respectively. if state status check, not even pressed one any (OFF), first cleared to "0" to more instructions by bits (b ₅₇₎ of the serial data proceeding to step CS462 12
Proceed to step CS402 in the figure. That is, this is the normal use state. On the other hand, if all the up / down keys A, B (805) to (808) are pressed in step CS400, the process jumps to step CS450 to enter a mode in which all display elements are turned on at the same time. First, set in more instruction "1" by the bit of the serial data (b ₅₇₎ at step CS450, from left to the interrupt disable state at step CS452, the display circuit from the control CPU (200) in step CS454 (500 ) To serial data. Here, as described later with reference to FIG. 29, upon receipt of this transmission, the display circuit (500) turns on all display elements. Next, in step CS456, the state of the switch (SW m) linked to the main switch (820) is checked, and this switch (SW m) is checked.
Wait while turning around the loop of step CS456 until m) turns off.

When the switch (SW m) interlocked with the main switch (820) is turned off in step CS456, it escapes to step CS458, and this time, similarly, it goes around the loop of step CS458 until this switch (SW m) is turned on. Here, when the switch (SW m) is turned ON, releasing the interrupt inhibition in step CS460, the more instructions of serial data bits (b ₅₇₎ at step CS462 is cleared to "0", FIG. 12 The process returns to the normal process after step CS402 in the figure.

FIG. 29 is a flowchart showing the processing operation of the display circuit (500) corresponding to the above, which is a modification of the external interrupt processing routine shown in FIG. In FIG. 29, first, in step D202, serial data is received from the control CPU (200) by an external interrupt, and then the serial end flag is checked in step D204. If this serial end flag is “1”, in step D206 Check all display instructions by bit (b ₅₇ ) of serial data. Here, if this bit (b ₅₇ ) is “0”, the process proceeds to step D210 and the normal display processing as described above is performed. On the other hand, if the bit (b ₅₇ ) of the serial data is “1”, step D208
By branching to, all display elements are turned on at the same time by setting "1" to all addresses in the display RAM, and the process jumps to step D240 in FIG. 12 and returns.

FIG. 30 is a flowchart showing a timer interrupt routine of the display circuit (500), which is a modification of FIG. 30th
In the figure, if a timer interrupt occurs, step D100
After the process of saving accumulator and the register in checks all display instruction by the bit serial data (b ₅₇₎ at step D101, the bit (b ₅₇₎ is "0"
If so, the process proceeds to step D102 in FIG. 16 to perform the normal process. On the other hand, if the bit (b ₅₇ ) is "1", the process jumps to step D140 in FIG. 16, the accumulator and the register restoration process is performed, and the process directly returns. That is,
If the bit (b ₅₇ ) is "1" in step D101 of Fig. 30, all display elements have already been displayed during the serial data reception processing, so do not perform processing during the timer interrupt. To return.

All of the up / down keys AB (805) to (8) are operated by the operations shown in the flowcharts of FIGS. 28 to 30.
You can enter a mode in which all display elements are lit by pressing 08) and closing the back cover, and even if you enter this mode, turn off the switch (SW m) linked to the main switch (820) once. By turning it on again after this, this mode is released and normal initial loading processing can be started.

EFFECTS OF THE INVENTION As described in detail above, the camera according to the present invention operates in association with the first microcomputer that operates based on the oscillation clock of the first frequency and the first microcomputer. A second microcomputer that operates based on an oscillation clock of a second frequency that is slower than the first frequency; and a starter that starts oscillation of the oscillation clock of the first frequency and the oscillation clock of the second frequency. A delay for delaying the start of the operation related to the second microcomputer of the operations of the first microcomputer for a predetermined time from the start of oscillation of the oscillation clock of the second frequency by the starting means until the oscillation stabilizes. And means.

Therefore, when the first microcomputer performs an operation related to the operation of the second microcomputer, the second microcomputer
The oscillation clock for driving the microcomputer is already stably oscillating, and the operation related to the second microcomputer can be surely performed.

[Brief description of drawings]

1 is a top view showing a camera of an embodiment of the present invention, FIG. 2 is a front view thereof, and FIG. 3 is an electric circuit diagram showing an electric circuit thereof.
4 and 5 are views showing respective display elements of the display unit provided on the upper surface of the camera body and the viewfinder,
6 to 12 are flowcharts showing the operation of the control circuit, and FIG. 13 is a diagram showing segments for displaying numbers, FIG.
14 to 26 are flowcharts showing the operation of the display circuit, FIG. 27 is a diagram showing changes in the display mode of the display unit, and FIG.
28 to 30 are flowcharts showing the operation of another embodiment. (200); first microcomputer, (261); first reset means, (500); second microcomputer, (504); second reset means.

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Norio Ishikawa 2-30 Azuchi-cho, Higashi-ku, Osaka City, Osaka Prefecture Osaka Osaka Building Minolta Camera Co., Ltd. Mitsuda Mitsunobu (56) References JP, A) JP 57-148726 (JP, A) JP 58-132735 (JP, A)

Claims (2)

[Claims] 1. A first microcomputer that operates based on an oscillation clock of a first frequency, and an oscillation of a second frequency that operates in association with the first microcomputer and that is slower than the first frequency. A second microcomputer which operates based on a clock; a starting means for starting oscillation of the oscillation clock of the first frequency and the oscillation clock of the second frequency; and an oscillation clock of the second frequency by the starting means For a predetermined time from the start of the oscillation of the
And a delay means for delaying the start of the operation of the microcomputer relating to the second microcomputer, the camera having a plurality of microcomputers. 2. The first microcomputer has means for transmitting data to the second microcomputer, and the second microcomputer is predetermined based on the data transmitted from the first microcomputer. The camera provided with a plurality of microcomputers according to claim 1, characterized in that the delay means delays the start of the operation of the transmitting means.