JPH0670786B2 - Electronic desk calculator - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION (A) Field of Industrial Application The present invention relates to an electronic desk calculator capable of confirming the progress of calculation by storing input data and sequentially reading and displaying the stored data.

(B) Conventional technology Generally, in an electronic desk calculator, for example, Japanese Patent Publication No. 55-51
As shown in Japanese Patent No. 222, the input numerical data is arithmetically operated and the operation result is displayed on the display.However, when the operation result is displayed, the input data cannot be confirmed. Since it is not, it was confirmed by repeating the same calculation 2-3 times without knowing whether the calculation result was correct. Although it is not difficult to repeat the calculation with simple calculation, the number of input of numerical data is large in the calculation of many items, which is not easy and troublesome.

(C) Problems to be Solved by the Invention The present invention has been made to solve the above-mentioned problems, and an electronic desk calculator configured to be able to sequentially display input data on a display even after completion of calculation. Is provided.

(D) Means for Solving the Problems The present invention comprises a memory for storing input numerical data corresponding to the input order, and a means for displaying the data in the memory together with the input order on the display means. Become.

(E) Operation According to this configuration, the data input so far after the calculation is completed can be displayed together with the input order.

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

FIG. 1 is a block diagram showing a configuration of an electronic desk calculator of the present invention. (1) is a control circuit constituted by a microprocessor, and a processing program is stored in advance in accordance with a key signal from a keyboard (2). Program memory (3)
According to the program, calculation, display control, etc. are performed.
(4) is a data memory in which numerical data or operator data input from the keyboard (2) is stored, and writing and reading of data are controlled by the control circuit (1), as shown in FIG. As shown by addresses 01 to 99
It is configured to store 99 items of data. Each address is composed of an area (4a) for storing operator data and an area (4b) for storing numerical data. Reference numeral (5) is a liquid crystal drive circuit for driving the liquid crystal display (6) based on the display data supplied from the control circuit (1). As shown in FIG. 2, the liquid crystal display (6) is configured to display numerical data in four rows, and the first row display (7), the second row display (8) and the third row display. (9) are display elements (7a) and (8a) for displaying the address numbers of the data memory (4), respectively.
(9a), operator symbol display elements (7b) (8b) (9b) and numerical data display elements (7c) (8c) (9c), input data are displayed sequentially and the progress of calculation can be confirmed. ing.
And the operator symbol display element (10
a) and a numerical data display element (10b) are provided, and are configured to display numerical data and calculation results. 4
The numerical data display element (10b) in the tier is formed to be larger than the numerical data display elements (7c), (8c), (9c) in the first to third tiers so that the numerical data and the calculation result can be easily seen. . Also, the K symbols (8d) and (9d) on the second and third display (8) and (9) are lit up to indicate the constant in the constant calculation, and (11) is not displayed but data is still displayed. When data remains in the memory (4), it is lit to indicate it, and (12) is a symbol indicating that the capacity of the data memory (4) is over.

Figure 3 is a diagram showing the keyboard layout of the keyboard (2). In addition to the usual numeric keypad (2a), the four arithmetic keys (2b), the subtotal key (2c) that displays the intermediate results of the operation, A scroll key for selecting the address of the data memory (4) in combination with the numeric keypad (2a), or for sequentially reading out and displaying the contents of the correction key (2d) and the data memory (4) for starting correction of the input data. It is composed of (2e) and (2f).

4 and 5 are diagrams showing the function of the memory or register built in the control circuit (1), and (13) is a display memory in which display data is stored, which corresponds to the display (6). The areas (13a) to (13d) correspond to the first to fourth steps of the display (6), and the area (13e) for storing the address data of the data memory (4) and the operator data are respectively stored therein. It is composed of an area (13f) and an area (13g) for storing numerical data. (14) is a register for storing the numerical data from the keyboard (2), the calculation result in an arithmetic circuit (not shown), etc. (14a) is the numerical data, (14b) is the constant data, (14c) Is the calculation result, (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 display memory (13). Are allocated so as to store the maximum address data stored in each. (14g) is a flag area composed of a plurality of flags. F1 is a register flag, F2 is an addition flag, F3 is a subtraction flag, F4 is a multiplication flag, F5 is a division flag, F6 is a correction flag, and F7 is The equal key flags are shown respectively. The control circuit (1) exchanges data between the data memory (4) storing the input data, the display memory (13) and the register (14) according to the program of the program memory (3) to perform arithmetic processing. Is configured.

Next, the operation of the present invention having such a configuration will be described with reference to FIGS.
Description will be given based on the flowchart of FIG. Here, a case of performing calculation of 5 + 3-2 + 4 + 7 = 17, for example, will be described.

First, when the "ON" key of the keyboard (2) is operated and the power is turned on, the control circuit (1) clears all the memory etc. and displays "0" on the fourth display (10) of the display (6). Is displayed. In this state, the control circuit (1) checks which key of the keyboard (2) is pressed, and when the first numerical value "5" is entered by the keyboard (2), the numerical value data is entered. Control circuit (1) incorporated in register (14a)
Displays the numerical data in the fourth row of the display (6) by setting the numerical flag (F1) and writing the numerical data in the area (13d) of the display memory (13) ( (See FIG. 12A).

Next, when the "+" key is pressed, the control circuit (1) sets the addition flag (F2), transfers the data of the number register (14a) to the constant register (14b), and the data memory (4). Register (14e) after checking if is full
The data “5” is written at the address of the data memory (4) which is +1 to the value of, that is, the 01th. At the same time, the address data "01" and the numerical data "5" are transferred to the area (13c) of the display memory (13). Therefore, the display device (6) displays the address data "01" and the numerical data "5" in the third row. Then, the value of the operation result register (14c), in this case "0", is added to the constant register (14b), and the operation result is stored again in the operation result register (14c). Thus, the operation of the "+" key causes the control circuit (1) to carry out such processing and return to the next key waiting state. At this time, the control circuit (1) writes the maximum address data, ie, "01" of the data memory (4) and the display memory (13) into the registers (14e) and (14f) (see FIG. 12B).

Then, when “3” is registered next, the register register (14
By inputting "3" into the area (13d) of the display memory (13) and (a), the state shown in FIG. 12C is obtained.

When "-" is continuously pressed, the control circuit (1) sets the subtraction flag (F3), transfers the data of the number register (14a) to the constant register (14b), and the data memory (4) After checking if it is full, register (14e)
The data is read and the data is written to the address which is +1. Therefore, "3" is written at address 02.
At the same time, after transferring the data of the area (13c) to the area (13b) of the display memory (13), the data of the address 02 is transferred to the area (13c). Therefore, the state shown in FIG. 12D is reached, and the display on the display (6) is moved one step. Then, the value “5” in the operation result register (14c) and the constant register (14
The addition operation of the value “3” of b) is performed, and the operation result is stored again in the operation result register (14c).

After that, in the same way, if you input sequentially from the keyboard (2),
When the processing by the control circuit (1) is performed as shown in FIGS. 12E to 12I and the equal key (2g) is finally pressed, the control circuit (1) resets the flag and then the equal flag (F7 ) Is set or not is determined. In this case, the data of the constant register (14b) and the operation result register (14c) that have not been set are added, the operation result is input to the operation result register (14c) again, and the area of the display memory (13) ( Transfer to 13d). Therefore, the calculation result is displayed on the fourth row of the display (6) (see FIG. 12J).

The display memory (13) becomes full, and when the next new data is input, the old data is deleted. When the data at address 04 is displayed, as shown in FIG. 12H, Address 01 data disappears and the display scrolls. Similarly, when the calculation is completed, as shown in FIG.
Addresses 01 and 02 have disappeared.

Next, if you want to know the intermediate result during the calculation,
When the sub total key (2c) of the keyboard (2) is pressed as shown in the figure, the control circuit (1) that captures the key signal
Transfers the value of the operation result register (14c) to the area (13d) of the display memory (13), and
The intermediate result is displayed in the column. At this time, the display element (⋄) indicating the intermediate result is turned on. Therefore, in the above example, 5 + 3
-If you want to see the result in the middle of -2, if you input 5 + 3-2 and operate the sub total key (2c), the state shown in Fig. 13 is displayed and the calculation result "6" is displayed on the display (6). It

Next, an operation for confirming whether or not the calculation result is correct after the calculation, that is, whether or not the input data is incorrect will be described. The display (6) at the end of the calculation shows 03 to 05
The address is displayed, and 01 and 02 have disappeared, so 01,
Scroll key (2
f) is operated. When the scroll key (2f) is operated once, the control circuit (1) that detects the scroll key signal
The maximum address of the display memory (13) is read from the register (14f) that stores the maximum address to the maximum address, the operation of maximum address-3 is performed, and the data is saved from the data memory (4) by specifying the address indicated by the operation result. Transfer to (14d). Then, the control circuit (1) shifts the data in the areas (13a) to (13c) of the display memory (13) downward by one step to empty the area (13a) and then displays the data in the save register (14d). The data is transferred to the area (13a) of the memory (13) and brought into the state shown in FIG. 14A. Therefore, the display device (6) disappears the data at address 05, displays the data at addresses 02 to 04, and scrolls the display one step. As a result, the control circuit (1) has a register (14f) that stores the maximum address of the display memory (13).
Data is rewritten to "04" and compared with the value of the register (14e) storing the maximum address of the data memory (4). Up to "05" is stored in the data memory (4), the maximum display is "04" and the display is smaller, so the control circuit (1) lights up the symbol (11) on the display (6). In addition to displaying the data, the data memory (4) further indicates that data is stored. When the scroll key (2f) is operated again, the data at address 01 is read from the data memory (4) and displayed as shown in FIG. 14B in the same manner as described above. Therefore, the data input from the first to the third can be confirmed by the display (6).

After confirming the 3rd input in this way, 4
When the scroll key (2e) is operated this time to see the second input data, the control circuit (1) which has detected the scroll key signal checks whether or not the correction flag (F6) is set. Since the correction flag (F6) is not set now, the control circuit (1) has the register (14f)
The larger display address number is read and the read value is incremented by one. "03" is stored in the register (14f), and data is read from the address "04" of the data memory (4) which is incremented by 1 and transferred to the save register (14d). The areas (13a) to (13 of the display memory (13) are
After shifting the data in c) upward by one step, the data is transferred from the save register (14d) to the area (13c) of the display memory (13). At this time, the register (14f) is changed to "04", and by comparing the values of the register (14e) and the register (14f), the symbol (11) is turned on in the same manner as described above. Thus, the state shown in FIG. 14A is obtained, and the fourth input data can be confirmed by displaying the data "04". Next, by operating the scroll key (2e) again, as shown in FIG.
The second data is displayed. 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, the display can be arbitrarily scrolled by operating the scroll keys (2e) and (2f), and the input data can be easily confirmed.

When the input data is input in the capacity of 99 items or more of the data memory (4), the control circuit (1) shifts the data of the data memory (4) to erase the old data, and at the same time, indicates the memory over. The display (6) is made to blink (12) to inform the operator that old data has been erased.

(G) Effect of the Invention As described above, the electronic desk calculator of the present invention is configured so that the input data is stored in the memory together with the input order and is sequentially read out and displayed after the operation is completed, so that an input error can be easily confirmed. Therefore, it is not necessary to repeat the calculation for confirming the calculation result unlike the conventional case. Further, when the data stored in the memory is displayed, the order in which the data is input is also displayed, so that it is possible to instantly find out what number of the input data is being confirmed.

[Brief description of drawings]

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 of FIG. 1, and FIG. 3 is a diagram showing the configuration of the keyboard of FIG. FIG. 4 is a diagram showing a configuration of a display memory, FIG. 5 is a diagram showing a configuration of a register, FIG. 6 is a diagram showing a configuration of a data memory, FIG. 7,
8, FIG. 9, FIG. 10, and FIG. 11 are flow charts showing the operating state of FIG. 1, FIG. 12A to FIG. 12J, FIG.
FIG. 14A and FIG. 14B are diagrams showing the operating states of FIG. 4, FIG. 5 and FIG. (1) ... Control circuit, (2) ... Keyboard, (3) ...
… Program memory, (4) …… Data memory, (5)
...... Drive circuit, (6) …… Display.

Front Page Continuation (72) Inventor Hiroshi Fukui 3-201 Minamiyoshikata, Tottori City, Tottori Prefecture Sanyo Electric Co., Ltd. (72) Inventor Kazuo Hirokawa 3-201 Minamiyoshikata, Tottori City Tottori Sanyo Electric Co., Ltd. (72) Inventor Satomi Okazaki 3-201 Minamiyoshikata, Tottori City, Tottori Prefecture Sanyo Electric Co., Ltd. (72) Inventor Yukichi Nishio 3-201 Minamiyoshikata, Tottori City, Tottori Prefecture Sanyo Denki Co., Ltd. (56) Reference References JP-A-58-213366 (JP, A) JP-A-58-213369 (JP, A) JP-A-56-114061 (JP, A)

Claims (1)

[Claims] 1. A keyboard for inputting data indicating numerical values and operators, a data memory for storing the data input from the keyboard at an address specified by the input sequence number, and an operation based on the input data. Calculation means for performing, display means for displaying input data and calculation results,
An electronic tabletop, comprising: reading means for sequentially displaying stored data of the data memory on the display means and also for displaying a number for specifying an address of the data memory where the displayed stored data is stored. calculator.