JPS61157965A - Electronic desk calculator - Google Patents

Abstract

PURPOSE:To confirm the progress of operations and to report disappearance of old data in case of memory over by providing a means which reads out and displays input data from a memory and a means which indicates memory- over. CONSTITUTION:A keyboard 2 is provided with hot only a ten-key for normal data entry, etc. but also scroll keys which read out and display successively contents of a data memory 4 where input data is stored. In case that the operation result is confirmed after the operation end, input data is displayed optionally on a display device 6 by the operation of scroll keys to confirm easily the operation result. If input data is inputted beyond the capacity of the memory 4, a control circuit 1 shifts data in the memory 4 to extinguish old data and flickers a symbol OVF12 indicating memory-over on the display device 6. Thus, an operator detects disappearance of old data.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of Industrial Use The present invention relates to an electronic desktop calculator that can store input data and check the progress of calculations by sequentially reading out and displaying the stored data.

(b) Conventional technology In general, electronic desktop calculators, for example,
As shown in Publication No. 51222, it is configured to perform four arithmetic operations on input numerical data and display the operation results on the display, but when the operation results are displayed, it is not possible to confirm the input data. Because of this, it was difficult to know whether the calculation results were correct or not, so confirmation was made by repeating the same calculation two or three times. In simple calculations, it is not difficult to repeat the calculations, but in multi-item calculations, numerical data must be entered many times, making it difficult and troublesome.

(c) Problems to be Solved by the Invention The present invention has been made in order to solve the above-mentioned problems. It provides a calculator.

(d) Means for solving the problem The present invention provides a memory for sequentially storing input numerical data, a means for sequentially reading and displaying the data stored in the memory, and a method for solving the problem when the input data exceeds the memory capacity. This consists of a means for indicating that old data has been deleted.

(E) Function Since the present invention is configured as described above, the progress of the calculation can be confirmed by reading out and displaying the data input so far from the memory after the calculation is completed, and the number of input data exceeds the memory capacity. In this case, it can be indicated that the old data has been completely deleted.

(f) Example Embodiments of the present invention will be described below with reference to the drawings.

FIG. 1 is a block diagram showing the configuration of the electronic desktop calculator of the present invention. (1) is a control circuit composed of a microprocessor, and a processing program is stored in advance in response to key signals from the keyboard (2). Program memory (3)
Perform calculations, display control, etc. according to the program. (
4) is a data memory in which numerical data or operator data input from the keyboard (2) is stored, and the writing and reading of data can be controlled by the control circuit (1), as shown in Figure 6. It is configured to be able to store 99 items of data indicated by addresses 01 to 99.

Each address is composed of an area (4a) for storing operator data and an area (4b) for storing numerical data. (
5) is a liquid crystal drive circuit that drives the liquid crystal display (6) based on display data supplied from the control circuit (1). The liquid crystal display (6) is configured to display numerical data in four stages as shown in Figure 2, with the first stage display (7), second stage display (8), and third stage display (9) are display elements (7) each displaying the address number of the data memory (4).
a) (8a) (9a) and operator symbol display element (7b
) (8b) (9b) and numerical data display element (7c
), (8c), and (9c), and allows input data to be displayed in sequence to confirm the progress of calculations. The fourth stage display (lO) has an operator symbol display element (10a),
A numerical data display element (10b) is provided and is configured to display numerical data and calculation results. The numerical data display element (10b) in the fourth stage is larger than the numerical data display elements (7c) (8c) (9c) in the first to third stages, so that the numerical data and calculation results can be easily seen. ing. In addition, the symbols (8d) and (9d) in the second and third rows of displays (8) and (9) are lit to indicate constants during constant calculation, and (11) indicates that there is no data other than what is displayed. It is lit to indicate when data remains in the memory (4), and (12) is a symbol indicating that the capacity of the data memory (4) has exceeded.

Figure 3 shows the key arrangement of the keyboard (2), in addition to the numeric keypad (2a) and four arithmetic keys (2b) used for entering regular numbers, the subtotal key (2c) is used to display intermediate results of calculations.
), data memory (4) in combination with numeric keypad (2a)
correction key (2d) and data memory (4) for selecting an address or starting correction of input data;
Scroll key (2e) to sequentially read and display the contents of
)(2f).

Figures 4 and 5 are diagrams showing the functions of the memory or register built into the control circuit (1), and (13) is the display memory in which display data is stored, and corresponds to the display (6). The areas (13a) to (13d) are the first row of the display (6).
Corresponding to the fourth stage, there is an area (13e) for storing address data of the data memory (4), an area (13f) for storing operator data, and an area (13f) for storing numerical data.
13g). (14> is the keyboard (2
) is a register that can store numeric data, calculation results in an arithmetic circuit (not shown), etc. (14a) stores numeric data, (14b) constant data, (14c) calculation results, (14d) is the transfer data from the data memory (4), (14e) is the maximum address data stored in the data memory (4), and (14f) is the maximum address data that can be stored in the display memory (13). It is distributed so that each can be memorized. (14g) is a flag area and consists of multiple flags, Fl is a numeric flag, F2 is an addition flag flag, F3 is a subtraction flag, F4 is a multiplication flag, F5 is a division flag, F6 is a correction flag and F7 indicates an equal key flag. The control circuit (1) follows the program in the program memory (3),
It is configured to exchange data between a data memory (4) storing input data, a display memory (13), and a register (14) to perform arithmetic processing.

Next, the operation of the present invention having the configuration described below will be explained based on the flowcharts shown in FIGS. 7 to 11. Here, a case will be described in which, for example, 5+3-2+4+7-17 is calculated.

First, the keyboard (2) is turned on. When the keys are pressed and the power is turned on, the control circuit (1) clears all the memory etc. and displays 10 on the fourth row of the display (6). ”
Display. In this state, the control circuit (1> is the keyboard (
It checks which key in 2) was pressed, and when the first number "5" is entered on the keyboard (2), the control circuit (1) that takes the entered number data into the number register (14a) ) displays the numeric data on the fourth stage of the display (6) by setting the numeric flag (Fl) and writing the numeric data into the area (13cl) of the display memory (13). (See Figure 12A).

Next, when the "+" primary key is pressed, the control circuit (1) sets the addition flag (F2>), transfers the data in the numeric register (14a) to the constant register (14b), and also transfers the data in the data memory (4). After checking whether the register is full or not (
Data ``5'' is written to the address 01 of the data memory (4), which is the value of 14e) plus 1.

At the same time, address data 101'' and numerical data r5. Transfer. Therefore, the display (6) shows address data 101'' and numerical data r5. can be displayed. Then, an addition operation is performed between the value of the operation result register (14c), in this case r(3), and the constant register (14b), and the operation result is stored again in the operation result register (14c).

Thus, upon operation of the "r+" key, the control circuit (1) performs these processes and returns to the state of waiting for the next key. At this time, the control circuit (1) writes the maximum address data of the data memory (4) and the display memory (13), ie, I"01", to the registers ('14e) and (14f) (see Fig. 12B).

Then, when "3." is entered, the number register (1
4a) and the area (13d) of the display memory (13).
is input, the state shown in FIG. 12C is reached.

When "1-" is successively pressed, the control circuit (1) sets the subtraction flag (F3), transfers the data in the numeric register (14a) to the constant register (14b), and also transfers the data in the data memory (4). After checking whether it is full or not, register (
14e) is read and the data is written to the address added by 1. Therefore, 13 is written to address 02. At the same time, the display memory (13) area (
After transferring the data of area (13c) to 02
The address data is transferred to area (13c). Therefore, the state shown in Figure 12 is reached, and the display (6) shows 1.
I can move steps. Then, an addition operation is performed between the value '5' of the operation result register (14c) and the value r3 of the constant register (14b), and the operation result is returned to the operation result register (14C).
to be memorized.

From now on, if you enter the information sequentially from the keyboard (2),
As shown in Figure 12 E to Figure 12 ■, the control circuit (1)
When the equal key (2g> is pressed), the control circuit (1) resets the flag and then determines whether the equal flag (F7) is set. In this case, it is not set. An addition operation is performed between the data in the constant register (14b) and the operation result register (14c), and the operation result is inputted again to the operation result register (14c) and also transferred to the area (13d) of the display memory (13). Therefore, the calculation result is displayed on the fourth stage of the display (6) (see FIG. 12J).

The display memory (13) is configured so that when the display memory (13) becomes full and new data is input, the oldest data is erased, so that when the data at address 04 is displayed as shown in Figure 12H, The 01 address data disappears and the display is scrolled. Similarly, at the end of the calculation, address 01.02 has been erased as shown in FIG. 12J.

Next, if you want to know the intermediate result during the calculation, use the first
As shown in Figure 3, when you press the subtotal key (2c) on the keyboard (2), the control circuit (1
) displays the value of the operation result register (14c) in the memory <1
By transferring to the area (13d) of 3), the display (
Display the intermediate results in the fourth row of 6).

At this time, the display element (◇) indicating the intermediate result lights up completely. Therefore, in the above example, if you want to see the intermediate result of 5+3-2, enter 5+3-2 and press the subtotal key (
2c), the state shown in FIG. 13 is reached and the calculation result r6J is displayed on the display (6).

Next, the operation of checking whether the calculation result is correct after the calculation is completed, that is, whether the input data is correct will be explained. At the end of the calculation, the display (6) shows 03 as shown in Figure 12J.
Since addresses up to 05 are displayed and address 01.02 has disappeared, operate the scroll key (2f) to display the data at address 01.02. Scroll key (2f
) is operated once, the control circuit (1) that has detected the scroll key signal reads the maximum address from the register (14f) that stores the maximum address of the display memory (13),
The maximum address -3 is calculated, and data is read from the data memory (4) and transferred to the save register (14d) at the address specified by the calculation result. Then, the control circuit (1) shifts the data in the areas (13a) to (13c) of the display memory (13) one step downward and displays the data in the save register (14d) with the area (13a) empty. memory(
13) to the area (13a) to create the state shown in FIG. 14A. Therefore, the data at address 05 disappears on the display 6), the data at addresses 02 to 04 are displayed, and the display is scrolled one step. As a result, the control circuit (1) uses the register (14f) that stores the maximum address of the display memory (13).
Rewrite the data to "04" and compare it with the value of the register (14e) that stores the maximum address of the data memory (4).The data memory (4) currently stores up to "05." The maximum display is 104" and the display is smaller, so the control circuit (1) lights up the symbol (11) on the display (6), and in addition to what is displayed, the data memory (4) Indicates that the data has been memorized. Then, when the scroll key (2f) is operated again, the data at address 01 is read out from the data memory (4) and displayed as shown in FIG. 14B in the same manner as described above. Therefore, the indicator (
6) allows you to check the data that has been input from the first to the third.

After confirming the input up to the third input in this way,
To see the input data, use the scroll key (
2c), the control circuit (1) detecting the scroll key signal checks whether or not the correction flag (F6) is out of cents. Since the correction flag (F6) is not set now, the control circuit (1) is
4f) The maximum display address number is read out and the read value is incremented by +1. The register (14f) has “03
'' is stored, and the data is read from the '04° address of the data memory (4) which is incremented by 1 and transferred to the save register (14d). Then, after shifting the data in areas (13a) to (13c) of the display memory (13) one step upward, the display memory (13) is transferred from the save register (14d).
) data is transferred to the area (13c). At this time, the register (14f) can be changed to "04", and the register (14f) can be changed to "04".
By comparing e) with the value of register (14f),
The symbol (11) can be lit in the same manner as described above. In this way, the state shown in FIG. 14A is reached, and the data '04' is completely displayed, allowing the fourth input data to be confirmed. Next, by operating the scroll key (2c) again, the fifth data is similarly displayed as shown in FIG. 12J. At this time, the values of the register (14e) and the register (14f) are the same, and the symbol (11) is turned off. In this way, scroll key (2e)'(
The display can be scrolled arbitrarily by the operation 2f), and input data can be easily confirmed.

If the input data exceeds the capacity of the data memory (4) by 99 items, the control circuit (1) will
4) is shifted and erased from the oldest data, and the symbol (12) indicating memory over is displayed on the display (
6) to notify the operator that old data has been deleted.

(G) Effects of the Invention As mentioned above, the Hiroko type car E calculator of the present invention is configured to store the input data in the memory and sequentially read and display it after the calculation is completed, so that input errors can be easily checked.
There is no need to repeat calculations as in the past to check the calculation results, and if the number of input data exceeds the memory capacity, the old data can be deleted by instructing the operator. This system notifies the operator of the input data and does not confuse the operator when checking the input data later, which is extremely effective in practical use.

[Brief explanation of drawings]

FIG. 1 is a block diagram showing the configuration of the electronic desk calculator of the present invention, FIG. 2 is a diagram showing the configuration of the liquid crystal display in FIG. 1, and FIG. 3 is a diagram showing the configuration of the keyboard in FIG. 1. 4 is a diagram showing the configuration of the display memory, FIG. 5 is a diagram showing the configuration of the register, FIG. 6 is a diagram showing the configuration of the data memory, FIG.
Figures 8, 9, 10, and 11 are flowcharts showing the operating states of Figure 1, Figure 14 A1, Figure 14 J1
13150, FIG. 14A1, and FIG. 14B are diagrams showing the operating states of FIGS. 4, 5, and 6. (1)...Control circuit, (2)...Keyboard, (3
)...Program memory, (4)...Data memory, (5)...Drive circuit, <6)...Display device.

Claims (1)

[Claims] (1) A keyboard for inputting numerical data, operator data, etc., a data memory for storing input data, means for detecting whether the number of input data exceeds the capacity of the data memory, and the means for detecting whether the number of input data exceeds the capacity of the data memory. means for instructing a memory overflow by output; means for controlling the memory so that the oldest data in the data memory is sequentially erased and new data is stored in memory when the memory is over; arithmetic means for performing an operation based on input data; and input data. and a display means for displaying the calculation result, and a reading means for sequentially reading out the data stored in the data memory and displaying it on the display means, and by sequentially reading and displaying the input data after the calculation, the input data can be confirmed. An electronic desktop calculator.