JPH02294716A - Electronic apparatus - Google Patents

Abstract

PURPOSE:To allow an electronic apparatus to cope with plural stop mode releasing factors by supplying a stop mode releasing signal to the interruption input terminal of a control device and an I/O port and instructing control to be successively executed simultaneously with the release of a stop mode. CONSTITUTION:After the lapse of 2 seconds, a timer circuit 8 generates an output and outputs an interruption request to the control device 1 to periodically release the stop mode. The control device 1 detecting the interruption request is turned to a driven state, outputs address data for selecting the I/O port 15 and reads out data from the I/O port 15 through a data bus. The control device reading out the data reads out time data from a clock circuit 7, and when the read data are different from time data written in a display memory included in a display control circuit 6, writes the data read from the circuit 7 in the display memory and is restored to the stop mode. Thus, the electronic apparatus can be allowed to cope with plural releasing factors.

Description

[Detailed description of the invention] (b) Industrial application fields The present invention relates to an electronic device that can be driven by a battery.

(Example) Conventional technology Recently, electronic devices such as word processors and electronic notebooks are battery-powered and portable, and a control device consisting of a microprocessor is used to control the devices to realize various functions. (For example, see Nikkei Mechanical 1988.4.4. pl06-108).

(c) Problems to be solved by the invention In such battery-powered electronic equipment, a liquid crystal display is used for display purposes, and low power consumption components made of C-MOS are used as semiconductor components. Although the power consumption is reduced by this, when the control device is operating, the power consumption is still several tens of mA, and the battery is consumed. For example, even when the watch mode is set and the time is displayed on the display, a considerable amount of power is consumed, resulting in a shortened battery life.

Therefore, if the control device is set to the stop mode, the power consumption can be reduced to about 10 μA, so by appropriately setting the control device to the stop mode, it is possible to reduce the power consumption considerably.

However, when the control device is set to stop mode, it becomes completely inactive, so if one of the multiple stop mode cancellation factors generates an interrupt request to the control device and the control device is re-driven, the control There was a problem in that the device could not determine which IL1gp to perform.

Furthermore, in the clock mode, if the control device went into the stop mode while the time was being displayed, there was a problem in which the display did not change even after the time elapsed.

(2) Means for Solving the Problems The present invention has been made to solve the above-mentioned problems, and includes a control device capable of setting a stop mode, and a stop mode release signal sent to an interrupt input terminal and an input/output port of the control device. It consists of a means for supplying energy, a clock circuit, and a display.

(e) Function Since the present invention was purchased as described above, when canceling the stop mode of the control device, the #I control device determines the type of interrupt request by determining the data of the input/output port and controls the control device. At the same time, even in the clock mode, the time display can be changed by driving the control device at predetermined time intervals.

(f) Example Embodiments of the present invention will be explained below based on the drawings.

FIG. 1 is a block diagram showing the overall configuration of the electronic device of the present invention, in which (1) is a control device that controls the entire device, and a program memory (2) that is composed of a microprocessor and stores a control program in advance. ) Each part is controlled according to the program.

(3) is a keyboard composed of data input keys such as a numeric keypad and alphanumeric keys, which supplies key signals to the control device (1). (4) is a data memory in which data input from the keyboard (3) or data processed by the control device (1) is stored, and data is read and written under the control of the control device (1). (5) is the data or control device input from the keyboard (3)! (1) The display device that displays the processed data is a dot matrix type liquid crystal display that is purchased with a display control circuit (6
) is displayed under the control of The display control circuit (6) is equipped with a display memory that stores display data corresponding to the display dots of the display device (5), and when the display data is written into the display memory by the control device (1), It is displayed on the display (5) under the control of the display control circuit (6). (7) is a clock circuit that generates the current time signal, and the keyboard (3)
When clock mode is set by key operation, control unit 1
i(1) reads the time data from the clock circuit (7) and displays the time on the display (5). (8) is a clock circuit (7)
This is a timer circuit that counts the predetermined pulse outputs output from the circuit and generates an output when a predetermined period of time has elapsed.In this case, it is designed to generate an output when two seconds have elapsed.

Figure 2 shows the configuration of the power supply circuit, in which the drive voltage (VCC) is supplied from the battery (9) via the t-source switch (10), and the backup voltage (Vccv) is supplied from the backup battery (1l) to the diode ( 12),
Furthermore, the drive voltage (Vcc) is supplied to the backup voltage (VccM) terminal via the diode (13).The backup voltage (VCCM) is supplied to the clock circuit (7).
and the data memory (4), and the other circuits are supplied with a drive voltage (Vcc).

Therefore, when the power switch (10) is in the ON state, the drive voltage (VcC) is applied to the entire device due to conduction of the diode (13).
is supplied, and in the OFF state, the diode (12) becomes conductive and the diode (13) becomes non-conductive, so that power is supplied only to the clock circuit (7) and the data memory (4), and the operating state is maintained. Ru.

FIG. 3 is a diagram showing the configuration of the interrupt function of the control device (1), and (14) is the interrupt input terminal (14) of the control device (1).
The output of the timer circuit (8) and various stop mode release signals are supplied to the OR gate connected to NMI). (15) (16) (17) are control devices (1)
At the input/output port of the control device ri! The address data supplied from the address bus (l8) of (1) is sent to the decoder (
19) is selectively driven by the output converted by I
It is connected to the IJ control device (1) by a data path (20). And the input/output port (15) has an OR gate (14).
) is supplied to the stop mode release signal, and is used to determine the type of stop mode release signal.

On the other hand, the input/output baud} (16) and (17) are the keyboard (
3) is connected to the key matrix circuit and used for scanning. (2l) is a NAND gate into which the output signal from the key matrix circuit is input, which detects a key operation when the control device (1) is in the stop mode;
It is connected to the input of the OR gate (14) to generate an interrupt request signal. The control device (1) is programmed in the program memory (2) so that it automatically enters the stop mode upon completion of one control process.

Next, the operation of the present invention having such a configuration will be explained using a clock display mode as an example.

The clock circuit (7) is supplied with voltage from the backup battery (11) even when the power switch (10) is OFF, and is always in operation. ) is not supplied with voltage, display i5 (5)
The time is not displayed.

When the power switch (10) is turned on, the drive voltage (Vcc) is supplied to the entire device and it becomes operational, so when you press the key to set the clock mode on the keyboard (3), you can enter the clock mode. The control device (
1) displays the current time on the display (5) by reading the time data from the clock circuit (7) and writing it into the display memory of the display control circuit (6).

If there is no key operation on the keyboard (3) to switch from the clock mode to the clock mode within a predetermined time, the control device (1) enters the stop mode and stops the operation. During this time, the drive voltage (Vcc) is still being supplied to the display control circuit (6), so the time is displayed on the display (5), but even if the time of the clock circuit (7) has passed, Since the control device (1) is stopped, the display on the display (5) does not change and does not function as a clock.

Therefore, in the present application, when the timer circuit (8) counts that two seconds have passed, it generates an output, generates an interrupt request to the control device (1) via the OR gate (14), and explicitly switches to the strike mode. It has been canceled. The control device that detected the interrupt request by this tL (will become operational until January, outputs address data to select the input/output port (15), and reads the data of the input/output port (15) via the data path (20)) Assuming that the data now consists of 8 bits, only the bit to which the output of the timer circuit (8) is supplied is set to I{ level, so the control device (1) that has read the data The circuit (8) determines that it is an interrupt from 9, immediately reads the time data from the clock circuit (7), compares it with the time data written in the display memory of the display control circuit (6), and checks whether the data is the same. If the time data is different, the controller 1 (1) writes the data read from the clock circuit (7) to the display memory and returns to the stop mode. As a result, the updated time is displayed on the display (5).As a result, in the clock display mode,
The control device (1) is released from the stop mode in 2 seconds by the timer circuit (8), and updates the time display.

Next, in another motionless v mode, while waiting for a key operation on the keyboard (3), the control device (1) is set to the stop mode to reduce power consumption, but the control device ( 1) When entering stop mode, the input/output port (17
) by setting all outputs to H level, the output of the inverter (22) is set to L level. As a result, when any key is operated, the line connected to the operated key becomes L level, and the NAND gate (
The output of 21) changes to the level ■{, and the OR gate (14
) of the control device (1) via the interrupt input terminal (NM i
) is supplied with a signal, and the input/output baud} (15
) is set to the ■{level.

Then, the control device C1 detects that there is an interrupt request.
') generates an address signal to select the input/output port (15) in the same way as above, reads the data of the input/output port (15) via the data path (20), and determines which interrupt request it is. However, since this is an interrupt from the keyboard (3), the next interrupt is from the input/output board (16) (1.7).
), and generates an address signal that selects the data path (
By generating a scan signal to scan the key matrix circuit at 20) and supplying it to the input/output port (17), and reading the return signal from the input/output port (05), the control unit 1 (1) It determines whether a key has been operated and performs control corresponding to the operated key.

In the above-mentioned embodiment, the stop mode of the control device (1) is canceled by the output of the timer circuit (8) and the output of the key manually. The stop mode can also be canceled by the output of the circuit, and this can be done by supplying the stop mode cancellation signal to the OR gate (4) and the input/output port (15).

(g) Effects of the Invention As described above, the electronic device of the present invention sets the control device to the stop mode when no control operation is required, thereby reducing power consumption, and also connects the interrupt input terminal of the control device to the input/output terminal. By supplying a stomp mode release signal to the port and instructing which control to perform next at the same time as stop mode is released, it is possible to respond to multiple stop mode release factors.It is battery-powered. It is highly effective when applied to electronic equipment.

[Brief explanation of drawings]

FIG. 1 is a block diagram showing the configuration of an electronic device according to the present invention, FIG. 2 is a circuit diagram showing the configuration of a power supply circuit, and FIG. 3 is a circuit diagram showing the main parts of FIG. 1 in detail. (1)...control device, (3)...keyboard, (5
)...Indicator, (7)...Clock circuit, (8)...
Timer circuit, (15) (16) (17)...input/output port. Applicant: Sanyo Electric Co., Ltd. and one other representative Patent attorney Takuji Nishino (two others) Figure 3 VCCM

Claims (2)

[Claims] (1) In an electronic device that is controlled by a control device that can be driven by batteries and that can be set to stop mode, a means for supplying a stop mode release signal to the interrupt input terminal and input/output port of the control device is provided, and the interrupt input terminal An electronic device characterized in that when a stop mode release signal is supplied to the control device, the control device released from the stop mode starts the next control based on the data of the input/output port. (2) The electronic device includes a clock circuit, a timer means for generating a stop mode release signal at a predetermined period, and a display for displaying time data from the clock circuit, and the control device is configured to release the stop mode from the timer means. 2. The electronic device according to claim 1, wherein the electronic device reads time data from a clock circuit and updates the displayed time on a display at a predetermined cycle based on a signal.