JPH0743695B2 - Electronics - Google Patents

Description

Description: TECHNICAL FIELD The present invention relates to an electronic device capable of selecting and operating any one of a plurality of operation modes.

More specifically, the present invention, as can be found in an electronic desk calculator, a word processor, an electronic typewriter, etc.,
The present invention relates to an electronic device that includes a display and data input means and that can operate by selecting a predetermined operation mode.

[Prior Art] An electronic desk calculator is taken as an example of this kind of electronic device, and the configurations of the LSI and the display, which are the main parts thereof, are classified as follows.

First, when using a P-MOS type LSI and using a fluorescent display tube as the display.

Secondly, a C-MOS type LSI is used and a liquid crystal display is used as the display.

According to the first combination, although both the LSI and the display device have a drawback that the power consumption is large, there is an advantage that the display is very easy to see. On the other hand, according to the above-mentioned second combination, both the LSI and the display have an advantage that the power consumption is very small, but the display is difficult to see.

Further, in order to set various modes, the electronic desktop computer according to the first combination is provided with a mechanical switch for designating modes such as rounding, decimal point, and printing, and when the power is cut off. Is also configured so that the mode setting state does not change. On the other hand, in the low-priced electronic desk calculator by the second combination, a special mode display symbol different from the data display section is provided in the display unit, and the mode is set using the touch keys. ing. Moreover, in this case, C- which consumes less power
By adopting a MOS type LSI, even when the operation is stopped by pressing the OFF key, the mode state is stored so that the mode state once set does not change.

Furthermore, in recent years, due to advances in semiconductor technology, C-MO
The high withstand voltage specification of the S-type LSI has been commercialized, and a third combination of using a fluorescent display tube as a display together with the C-MOS type LSI is about to be realized.

However, in the case of the third combination, there is a drawback that the structure of the display becomes complicated and expensive because of the necessity of providing a special mode display symbol.

[Object] In view of the above points, an object of the present invention is to display an operation mode on a display unit by operating a switch for setting an operation state of an electronic device, and further, when the electronic device is in an operation state, change to the above-mentioned operation state. To provide an electronic device capable of updating the operation mode set in the electronic device by further operating the switch.

In order to achieve such an object, the present invention operates in accordance with any one of a plurality of operation modes, and in an electronic device that displays a result of the operation by a display means, has a function of instructing a mode setting state and an operation of the electronic device. A manual switch having a function of instructing, a mode instructing switch for instructing each of a plurality of operation modes, a mode storing means for storing an operation mode in response to an instruction from the mode instructing switch, and a depression of the manual switch In response to the operation of the electronic device and in the mode setting state, in response to the instruction of the mode instructing switch, the operation mode is stored in the mode storing means, and the instruction stored in the mode storing means is stored. The first storage control means for bringing the operating mode into a state in which it can be stored in the display storage means, and the manual switch in the operating state of the electronic device. In response to the re-depressing, the operating state of the electronic device is maintained, the mode setting state is set, the operating mode of the mode storing means is updated and stored in response to a new instruction from the mode instruction switch, and It is realized by providing a second storage control means for setting the contents of the mode storage means into a state in which the contents of the display storage means can be stored, and a display control means for displaying the contents of the display storage means on the display means. is there.

[Examples] Hereinafter, the present invention will be described in detail based on Examples.

FIG. 1 is an external view showing an embodiment of an electronic desk calculator with a printer to which the present invention is applied. In the figure, KB is a keyboard provided with numeric keys, function keys, etc., DISP is a display device for displaying numerical data of the operation mode according to the present embodiment (described in detail later), PR Is a printing device for printing output.

FIG. 2 shows the keyboard KB and the display device shown in FIG.
It is the figure which expanded and showed a part of DISP. Here, MKI is a mode display designation key for selecting a display mode on the display device DISP. This mode display designation key MK
I also functions as a power-on key for putting the present embodiment into an operating state.

Further, MK2, MK3, and MK4 are a rounding specification key, a decimal point position (TAB) specification key, and a paper feed / print mode specification key for specifying the paper feed or print mode of the printer PR.

MP is a mode pattern drawn corresponding to each digit position of the display device DISP, and "5/4" is placed at the position corresponding to the first digit.
"F" for the second digit, "0" for the third digit, "2" for the fourth digit, "3" for the fifth digit, and sixth digit. "+" Is written in the box and "PRT" is written in the 8th digit.

MD indicates a display mode when the display device DISP is used as an operation mode display. Where the first digit (D1)
For, regarding the 7th segment, since only the d segment is lit, the rounding switch is in the "ON" state. Also, the fourth digit (D4) and the eighth digit (D
Since each of the d segments in 8) is lit, it indicates that the decimal point position (TAB) is designated to display "2" digits after the decimal point and the print mode is designated.

ND indicates a display mode when the display device DISP is used as a numerical display. That is, this display mode represents a normal display state as an electronic desk calculator, and displays numerical data and calculation results.

The above-described two display modes MD (mode display) and ND (numeric display) can be switched by pressing the mode display designation key MK1. However, when the power is turned on, the display mode of MD (mode display) is initially set (for details, refer to section 4).
It will be explained in the following figures).

FIG. 3 is a block diagram showing the entire electrical configuration of this embodiment. In the figure, the keyboard portion KB is provided with keys for specifying numerical values, functions, etc., and a key group such as the above-described mode display designation key MK1 and rounding key MK2.

CPU is a central processing unit composed of 1-chip LSI,
It contains each of the following elements:

First, a memory unit MU for storing information input from the keyboard unit KB is provided, and this memory unit has registers AR, BR, CR for storing numerical data and a flag group FF for storing flag information.
In addition to TAB, M, a storage unit for storing various mode states
It is composed of F, PRT, counter CT for counting 5/4 and 4 digit data. The register AR is also used as a display register, and the contents of the register AR can be displayed. Each of these components is a normal RAM
It is configured by using (random access memory).

In order to perform arithmetic processing on the numerical information and operation mode designation information stored in each of the above registers, the arithmetic unit AC is configured by using various adders and determination circuits.

In addition, the CPU has information for controlling an input control unit IC and an output control unit OC, which will be described later, in addition to the calculation unit AC and the memory unit MU,
In addition, it is provided with a fixed storage unit RU that stores information for controlling various processes corresponding to the operation mode. The fixed storage unit RU is composed of a read only memory (ROM), an instruction decoder and the like.

The input control unit IC described above outputs a key scanning signal to the keyboard KB in accordance with an instruction from the fixed storage unit RU,
By receiving the signal, the operated numeric keys,
Function key identification and various mode specification keys MK1 to M
Determine K4.

The output control unit OC described above decodes the contents of the register AR in which the input data and the operation result data are stored by a segment decoder (not shown), and this is decoded by the display device.
The print control is performed so that the display is output to the DISP or the content of the register AR is printed by the printer PR.

The display device DISP includes a numerical display composed of a fluorescent display tube.

BT is a power supply unit for driving the present embodiment and includes a battery.

ACC is a power-on detection unit, and is configured as shown by using resistors, capacitors, and diodes. With such a configuration, when the battery is inserted, the ACL terminal is maintained at the Vss level for a predetermined time, and the CPU is informed of power-on.

The Reset key is a reset key for all resetting the present embodiment, and forcibly sets the potential of the ACL terminal to the same state as when the power is turned on.

The operation of this embodiment configured as described above will be described with reference to the display state list shown in FIG. 4 and the flowcharts shown in FIGS. 5 (A) and 5 (B).

First, when a battery is inserted into the power supply unit BT shown in FIG. 3 or the reset key is pressed to detect a predetermined signal at the ACL terminal, the automatic storage of the fixed storage unit RU included in the CPU is started.
The processing starts from the clear processing address (usually set to address 0). Thus, the process of step S1 shown in FIG. 5 (A) is executed.

When the power-on is detected in step S1, the "0 → MU" instruction is executed in the next step S2. this is,
The contents of the memory unit MU are all cleared to "0".

Next, “1 → F _5/4 ” is executed in step S3. That is, the flag that stores the rounding mode is set to "1" and the state for performing the rounding process is set.

In step S4, "0 → F _TAB " is executed. This is F _TAB as a TAB counter that stores the decimal point position designation state.
F0,2,3, + specified by the decimal point position specification key (MK3)
The following five are stored. Here, since it is reset to "0", the F (floating) mode is stored.

In step S5, "1 → F _PRT " is executed, and the print control mode state is stored by setting the print control mode flag F _PRT to "1". After that, the process jumps to the processing routine (C routine) after step S21, and the processing for executing the mode display is performed.

First, in step S21, the “F → AR” command is executed,
It stores a blanking code "F" for not displaying all the digits in the register AR (see FIG. 3) which is a display register.

Next, in step S22, a determination command "F _5/4 = 1?" Is executed. Since _{F5 / 4} has been set to 1 at step S3, step S23 is executed as a positive determination.

In step S23, "E → AR ₁ " is executed. As a result, the data code "E" is transferred to the first digit of the register AR. The "E" code in the register AR is the output control unit OC
Among the 7 segments included in the display, only the d segment is turned on by the segment decoder inside. The technique for executing such a function is a well-known technique, and detailed description thereof will be omitted. Further, by changing the segment decoder, it is possible to light only the other segment instead of the d segment.

In step S24, it is determined whether or not the TAB counter F _TAB is "0". Here, in step S4, F _TAB =
Since it has been reset to "0", an affirmative determination (YES) is made, and "E → AR ₂ " of step S25 is executed. That is,
The "E" code is transferred to the second digit of the register AR.

Next step S26, step S28, step S30, step S3
It is determined from 2 whether the TAB counter is 1 or 2 or 3 or 4, but in either case, a negative determination is made (NO), and steps S27, S29, S31, and 33 are executed. Not done.

Next, in step S34, it is determined whether or not "F _PRT = 1". Here, since it is set to "1" in step S5 (YES), the "E" code is transferred to the eighth digit of the register AR in step S35. As a result, "FFFEFFFFFEE" is stored in the register AR, and the "E" code is stored in the first, second, and eighth digits.

In step S36, "1 → MF" is executed, and the mode flag (see FIG. 3) indicating the mode display state is set to "1".

In step S37, the "DISP ON" command is output to the output control unit OC, the data in the register AR is decoded there, and as shown in step NO.1 of the display state list shown in FIG. A 2,2,8 digit d segment is displayed. As a result, it is possible to display that the rounding mode is selected as the current mode and the decimal point position TAB is the F (floating) mode and the print designation is the print ON mode.

In step S38, "0 → CT" is executed, and the counter CT for performing the mode display state for a fixed time is cleared to "0". Then, the next key operation detection routine A
Jump to routine.

At the first step S8 in the A routine, "KEY = ON?"
Is executed to determine whether or not the key is pressed. If all the keys have not been pressed (NO), it is determined in step S9 whether the mode flag MF is 1 or not. Now it is in the mode display state,
Since the mode flag MF is set to 1 (YES),
In step S10, the instruction “CT + 1 → CT” is executed, and the content of the counter CT is incremented by 1.
Since the counter CT is now reset to "0",
0 + 1 is executed and the counter CT becomes "1".

Next, in step S11, a command for determining whether or not “CT = 1000” is executed, and if the content of the counter CT is not 1000, step S8 → step S9 → step S10 → step S11 → until 1000 is reached. The routine of step S8 → step S9 ... Is repeated. By configuring the flow so that it takes about 5 msec to execute this loop only once, the counter CT becomes 1000 when no key is pressed for 1000 × 5 msec = 5 seconds, and in step S11 An affirmative judgment (YES) is made. Thus, the jump to the normal display state processing routine (D routine) is performed.

In step S15, the blanking code "F" is stored again in the register AR.

In the next step S16, the data in the register BR is transferred into the register AR. Since the register BR is now reset to "0", the first digit "0" code is the register
Transferred to the first digit in AR.

Next, in step S17, the counter CT is cleared to "0".

In step S18, the mode flag MF is reset. As a result, the mode display state is canceled and the next step S1
The data in the register AR is displayed on the display device DISP by the "DISP ON" instruction in 9 (see step NO.2 shown in FIG. 4). Thus, "0." is displayed on the display device DISP.

Thus, immediately after the power is turned on, the "mode display state" is maintained for about 5 seconds, and then the "normal display state" is automatically restored. This mode display state time is further shortened by setting the number of discrimination in step S11 to "500",
By setting it to "2000", it is possible to further lengthen it and to set the desired time accordingly.

After that, like the last time, the routine jumps to the A routine. That is, it is determined in step S8 whether or not the key is pressed, and in step S9, the content of the mode flag MF is determined. This time, not the mode display state, but the mode flag
Since the MF has been reset (NO), the A routine processing is executed again. Thus, steps S8 and S9 are repeated until any key is pressed,
The display of "0." is continued.

Next, the case where the mode display designation key MK1 which also functions as the power-on key for turning on the CPU is pressed will be described.

First, in step S8, key press is detected (YE
S), it is determined in step S12 whether it is the same as the previously pressed key. In this case, since it is the first key (NO), the display device DISP is turned off in step S13.

In step S20, it is determined whether the key is the mode display designation key MK1. In this case, an affirmative determination (YES) is made, so that the mode state display processing routine (C routine) is executed as in the previous case. That is, step S21
→ step S22 → step S23 → step S24 → step S
25-> step S26-> step S28-> step S30-> step S32-> step S34-> step S35-> step S36-> step S37-> step S38-> A routine is executed and the mode display state of NO.3 step shown in FIG. 4 is achieved. .

Next, a description will be given of processing in the case where the paper feed / print mode designation key MK4, which also serves as a paper feed key for instructing the paper feed of the printer PR and a print key for designating the print mode, is pressed.

First, a key press is detected in step S8 of the A routine, and then it is determined in step S12 whether or not the keys are the same. When a negative determination (NO) is made in step S12, the display is erased in step S13.

Next, in step S20, it is determined whether or not the mode display designation key MK1 is present (NO), and further in step S39, it is determined whether or not the mode is in the mode display state. Since the MF = 1 mode is being displayed (YES), it is determined in step S40 whether or not the decimal point position designation key MK3. In this case, since a negative determination (NO) is obtained, the control shifts to the B routine of FIG. 5 (B).

In step S44, it is determined whether or not it is the paper feed / print mode designation key MK4 (YES), and in step S45, it is determined whether or not the print flag F _PRT is 1. Now, the print is on and F _PRT is "1".
S), F _PRT is reset to "0" by step S46.

If the print flag F _PRT is “0”, the process proceeds from step S45 to step S47, and F _PRT is set to “1”. Next, the process jumps to the mode state display processing routine (C routine) and the same display processing as the previous time is executed. That is, step S21 → step S22 → step
S23 → step S24 → step S25 → step S26 → step S28 → step S30 → step S32, and then step S34
In the determination of "F _PRT = 1?" In step S35, since F _PRT has already been reset to "0" (NO), step S35.
Is not executed. Therefore, the blank code is still stored in the eighth digit of the register AR.

Then, step S36 → step S37 → step S38 → A
Proceeding to the routine, as shown in step NO.4 of FIG. 4, the d segment of the eighth digit indicating the print mode is turned off. As described above, by pressing the paper feed / print mode designation key MK4 during the mode display state, the print mode can be changed.

Next, the operation when the decimal point position designation key MK3 is pressed will be described.

When the decimal point position designation key MK3 (hereinafter referred to as the TAB key) is pressed, as in the previous time, step S8 → step S1
2 → step S13 → step S20 → step S39 → step
The processing is sequentially executed from S40, and it is determined whether or not the TAB key is pressed in step S40 (YES), and further in step S41, “F _TAB
+ 1 = F _TAB ”is executed. That is, 4-bit F _TAB
The flag is incremented by 1, and the content of F _TAB changes from "0" to "1".

Next, in step S42, it is determined whether or not F _TAB is "5", and if "5", the contents of F _TAB are reset to "0". Now, F _TAB is "1" (NO), so jump to the mode status display processing routine (C routine),
Display processing similar to the previous time is executed. That is, the process proceeds to step S21 → step S22 → step S23 → step S24.

In step S24, since the content of F _TAB is "1" (NO), an affirmative judgment (YES) is made in the next step S26, and the "E" code is stored in the eighth digit of the register AR in step S27. .

Then, step S28 → step S30 → step S32 → step S34 → step S36 → step S37 → step S38 →
The routine proceeds to the A routine, and the d segment at the first digit and the third digit are lit as shown in No. 5 step shown in FIG.
As a result, it is displayed that the rounding-off mode has been designated and the "0" mode that represents "0" digits after the decimal point has been designated. It is possible to change the setting of the decimal point position from "F" to "0".

Next, when the TAB key is pressed again, the A routine is executed as in the previous time. That is, step S8 → step S12
→ step S13 → step S20 → step S39 → step S
The sequence is 40 → step S41 → step S42 → C routine. As a result, F _TAB becomes “2”, and step S21 → step S22 → step S23 → step S in the C routine.
24 → step S26 → step S28 → step S29 is executed. Thus, the "E" code is transferred to the fourth digit of register AR.

Next, step S30 → step S32 → step S34 → step S36 → step S37 → step S38 → A routine is executed, and as shown in step NO.6 of FIG. 4, d of the first digit and the fourth digit is performed. Only the segment lights up. This allows
It is displayed that the number of digits after the decimal point has been changed from "0" to "2". In this way, it is possible to change the mode state by pressing the TAB key during the mode display state.

After that, if no key is pressed for about 5 seconds, the mode display state is changed to the normal display state as described in step No. 7 of FIG. 4, as already described.

Next, when the OFF key, which is normally equipped on a normal electronic desk calculator that uses C-MOS LSI, is pressed, the flip-flop F _ON for designating the operation ON state is reset to "0". To be done. This flip flop F _ON
Controls ON / OFF of the clock oscillation circuit (not shown) inside the LSI, so that the clock oscillation is stopped by being reset, thereby saving the power consumption. However, even if the clock oscillation is stopped, the memory unit MU
Since it remains connected to the power supply, the stored data will not disappear.

When this OFF key is pressed, step S8 → step S12
→ step S13 → step S20 → step S39 → step S
The program proceeds to 52, where it is determined whether the key is the OFF key. Next, in step S53, "0 → F _ON " is executed, and N in FIG.
The display disappears as shown in step O.8.

Next, the processing when the ON key (which MK1 also serves) is pressed will be described.

When the ON key is detected in step S6, the flip-flop F _ON is set to "1" in step S7. As a result, the clock oscillation circuit (not shown) starts oscillation and the next C routine process is executed.

The C routine is a mode state display processing routine, and since the mode information of the memory unit MU is held, step S21 → step S22 → step S23 →
Step S24 → Step S26 → Step S28 → Step S29
→ step S30 → step S32 → step S34 → step S
The process is executed in the order of 36 → step S37 → step S38. Thus, the mode display as shown in step No. 9 of FIG. 4 is performed.

Next, press the paper feed / print mode specification key while the mode is displayed.
The operation will be described when MK4 is continuously pressed.

First, a key press is detected in step S8 of the A routine, and step S12 → step S13 → step S20 → step S39 → step S40 → step S44 → step S45 → step S47 is executed, so that F _PRT becomes “1. Is set.

Then, in the C routine, step S21 → step S22
→ step S23 → step S24 → step S26 → step S
28-> step S29-> step S30-> step S32-> step S34-> step S35 are executed, and the "E" code is transferred to the eighth digit of the register AR.

Next, step S36-> step S37-> step S38-> A routine is executed, and the mode display as shown in step NO.10 of FIG. 4 is performed. If the paper feed / print mode designation key MK4 is further pressed as it is, an affirmative determination is made in step S8 of the A routine, and the flow proceeds to step S12. There, it is determined whether or not the same key as the previous time is being pressed. As a matter of course, since the keys are the same (YES), the counter CT is reset to "0" in step S14. After that, the routine returns to the A routine again, and the instruction of step S8 is executed.

As described above, while the paper feed / print mode designation key MK4 is continuously pressed, step S8 → step S12 → step S
The 14 routines are repeated and the mode display state is maintained.

After that, when the pressing of the paper feed / print mode designation key MK4 is released, the step S8 → step S9 → step S10 → step S11 of the A routine is repeated and the CT counter is set to 0.
Counts from 1 to 1000. After that, step S15 of step D → step S16 → step S17 → step S18 →
Step S19 is executed and the paper feed / print mode designation key M
The normal display will appear about 5 seconds after K4 is released.

Next, an operation will be described for a case where a key other than the mode designation key, for example, the numeric key “5” is pressed in the mode display state in which the mode state counter CT is 1000 or less.

First, when the numeric key “5” is pressed, the key press is detected in step S8 of the A routine, and then step S1.
2 → step S13 → step S20 → step S39 is executed. At this time, since the mode is being displayed, step
The sequence proceeds from S40 → step S44 → step S48 → step S52 → step S54 → step S55, and in step S56, the register process of “5” is executed in the register BR (this is a well-known technique, and therefore a detailed description will be given. Omitted).

After that, the routine jumps to the normal display routine (D routine), and step S15 → step S16 → step S17 → step S18 → step S19 is executed. As a result, the data "5" in the register BR is displayed and the mode display state is canceled. Thus, as shown in step No. 11 of FIG. 4, when any key other than the mode setting key is operated during the mode display state, that key is executed and the mode display state instantly transits to the normal display state. It will be.

Next, in the normal display state, various mode setting keys MK2, MK3, MK
The operation when 4 is pressed will be described.

First, when the paper feed / print mode designating key MK4 is pressed, the processes following the A routine are executed. That is, step S8 → step S12 → step S13 → step S20 →
Execution is performed with step S39. At this time, since it is not in the mode display state, a negative determination (NO) is made in step S39, and the processing of the E routine is executed.

First, in step S52, it is determined whether or not it is the OFF key (NO), in step S54, it is determined whether or not the currently pressed key is the mode setting key (YES), and further, step S56. At, it is determined whether the paper feed / print mode designation key MK4 is selected (YES). Therefore, in step S57, the paper feed processing command of the printing device is output to the output control unit, and the paper feed of the recording paper is executed.

In this way, the paper feed / print mode designation key MK4 operates as a paper feed key in the normal display state.

After that, the routine jumps to the normal display processing routine (D routine), and the processing of step S15 → step S16 → step S17 → step S18 → step S19 is executed, and N in FIG. 4 is executed.
The paper feed process is executed at the same time as the display shown in step O.12 is made, but the print mode does not change.

Similarly, when the TAB key MK3 or the rounding specification key MK2 is pressed, step S8 → step S12 → step S13 → step S20 → step S39 → step S52 → step S54 → step S56 → normal display processing of the D routine. Is executed. Therefore, not only the contents of F _TAB but also the state of F _5/4 do not change, and it becomes non-operation.

This can be confirmed by pressing the mode display designation key MK1. That is, the mode display designation key MK
When 1 is pressed, step S8 → step S12 → step
S13 → step S20 → step S21 → step S22 → step S23 → step S24 → step S26 → step S28 → step S29 → step S30 → step S32 → step S34 → step S35 → step S36 → step S37 → step S38 →
The processing of the A routine is executed, so that the display shown in step NO.15 of FIG. 4 is obtained. Such a display is shown in FIG.
This is the same as the display in step NO.10, which confirms that there is no change in the mode designation.

In this embodiment, in order to perform the mode display, only the d segment among the 7 segments is turned on, but it is also possible to turn on the other segments or use a decimal point display element, a scale display element and the like. .

Further, although the above description relates to the electronic desk calculator, it is needless to say that the present invention can be applied to a word processor, an electronic typewriter, etc. which perform various functions according to a plurality of operation modes. .

As described above, according to the embodiment of the present invention, since it is possible to perform the switching display between the mode display and the normal display using the same display device, it is possible to realize an inexpensive electronic device using a versatile display device. You can

When the present invention is applied to an electronic desk calculator,
In addition to the effects of the invention described above, the following special effects can be obtained.

By providing a mode display designating key that also has the function of an ON key for operating the CPU, it operates as an ON key when the CPU is in the off state, while the mode of the display mode of the display device is operated when the CPU is in the on state. It can be operated as a mode display designation key for setting the display state.

Furthermore, by providing the key described in the above section,
Since the number of keys can be reduced more than ever before, an inexpensive and convenient electronic desk calculator can be obtained.

A mode display can be performed by using a segment-type display element to light only the d segment, which is one of the seven segments, for example.

[Effect] As described above, according to the present invention, a manual switch having a function of instructing a mode setting state and a function of instructing operation of an electronic device, a mode instruction switch instructing each of a plurality of operation modes, and Mode storage means for storing an operation mode in response to an instruction from the mode switch; and an operation instruction for the electronic device in response to the depression of the manual switch, and a mode setting state, and a response to the instruction from the mode instruction switch. First storage control means for storing the operation mode in the mode storage means and setting the instructed operation mode stored in the mode storage means in the display storage means, and the operation state of the electronic device. In response to the re-depressing of the manual switch, the operation state of the electronic device is maintained, and the mode setting switch is set to the mode setting state. In response to the new instruction, the second storage control means for updating and storing the operation mode of the mode storage means and for setting the contents of the mode storage means into a state in which the contents can be stored in the display storage means; By providing a display control means for displaying the contents of the means on the display means, the operation mode is displayed on the display means by operating a switch for bringing the electronic device into an operating state, and further,
When the electronic device is in the operating state, the operating mode set in the electronic device can be updated by further operating the switch for setting the operating state.

[Brief description of drawings]

FIG. 1 is an external view of an electronic desk calculator with a printer according to an embodiment of the present invention, FIG. 2 is an enlarged view of a keyboard unit and a display device included in this embodiment, and FIG. FIG. 4 is a block diagram showing an electrical configuration, FIG. 4 is a diagram showing a relationship between key operations and display contents thereof according to this embodiment, and FIGS. 5 (A) and 5 (B) are for controlling this embodiment. It is a flowchart which shows a procedure. KB ... Keyboard section, CPU ... Central processing section, MU ... Memory section, AC ... Calculation section, RU ... Fixed storage section, IC, OC ... Input / output control section, BT ... Power supply section, ACC ... Power-on detection section, DISP ... Display device, PR ... Printing device, MK1 ... Mode display designation key, MK2 ...
Rounding specification key, MK3 ... Decimal point position specification key (TAB key), MK4 ... Paper feed / print mode specification key.

Claims (1)

[Claims] 1. An electronic device which operates in accordance with any one of a plurality of operation modes and which displays the result of operation on a display means, has a function of instructing a mode setting state and a function of instructing the operation of the electronic device. A manual switch, a mode instructing switch for instructing each of a plurality of operation modes, a mode storing means for storing an operation mode in response to an instruction from the mode instructing switch, and an electronic device in response to pressing of the manual switch. Instructing the operation and setting in the mode setting state, storing the operation mode in the mode storage means in response to the instruction of the mode instruction switch and displaying the instructed operation mode stored in the mode storage means And a first memory control means for making a state in which the electronic device can be stored, and an electric power in response to the re-depression of the manual switch in the operating state of the electronic device. The operation mode of the mode storage means is updated and stored in response to a new instruction of the mode instruction switch while maintaining the operation state of the device and in the mode setting state, and the contents of the mode storage means are displayed on the display. An electronic device comprising: a second storage control means for making the storage means memorable; and a display control means for displaying the contents of the display storage means on the display means.