JPS61213963A - Electronic calculator - Google Patents

Abstract

PURPOSE:To easily discriminate whether there is input data or not except for one displayed by deciding whether the data is present or not after the data displayed on a display device for displaying the input data, and providing a means for displaying. CONSTITUTION:A numeric value of operation and an operator symbol of an input data are successively displayed on numeric value display elements 7c, 8c, 9c and operator symbol display elements 7b, 8b, 9b of a display device 6. In this case the display of the display device 6 is full, and then old data are erased one by one and replaced by a new data. A control circuit 1 successively stores the old data in a data memory and lights a display element 11 to display the display data being accumulated in the data memory 4. Accordingly, an operator watches this display and operates a scroll key sequentially, thereby an old arithmetic input data can be watched.

Description

DETAILED DESCRIPTION OF THE INVENTION (a) Field of Industrial Application 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 are
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. Therefore, it was difficult to know whether the calculation result was correct or not, so confirmation was made by repeating the same calculation two or three times. For simple calculations, it is not a pain to repeat the calculations, but for multi-item calculations, numerical data must be entered many times, 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 is capable of sequentially displaying input data on the display even after the completion of calculations. The present invention provides an electronic desktop calculator that is configured to indicate data subsequent to the current data, if any.

(d) Means for solving the problem The present invention includes a memory for sequentially storing input numerical data, a means for sequentially reading and displaying the data stored in the memory, and a means for sequentially reading out and displaying the data stored in the memory, and having data after the displayed data. It is composed of a means for determining whether or not the data is present, and an instructing means for instructing the data if it exists.

(E) Function Since the present invention is configured as described above, after the calculation is completed, the data inputted up to that point is read out from the memory and displayed, thereby making it possible to check the progress of the calculation and to display the data on the display. When data subsequent to the data is further stored in the memory, an indicator is lit, making it easy to check the progress of the calculation.

(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 desk calculator of the present invention, in which (1) is a control circuit composed of a microprocessor, in which 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 is controlled by the control circuit (1), as shown in Fig. 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 constructed so that numerical data can be displayed in four rows as shown in Figure 2, with Table 1 (7) in the first row, display (8) in the second row, and display in the third row. (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 elements (7c) (8
c) (9c), and allows input data to be displayed sequentially to confirm the progress of calculations. The fourth stage display (10) is provided with an operator symbol display element (10a) and a numerical data display element (10b), and is configured to display numerical data and calculation results. The fourth stage numerical data display element (10b) is larger than the first to third stage numerical data display elements (7c) (8c) (9c), making it easier to see the numerical data and calculation results. There is. Also, the symbol (8d) is displayed in the second and third rows (8) and (9).
) (9d) is lit when indicating a constant during constant calculation,
(11) In addition to what is displayed, there is still data memory (4
) is lit to indicate that data remains in the memory (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 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). (13) is the display memory that stores display data, 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 in which numeric data, calculation results from an arithmetic circuit (not shown), etc. are stored. (14a) stores numeric data, (14b) constant data, (14C) calculation results, ) 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 stored in the display memory (13). They are distributed to store data respectively. (14g) is a flag area and is composed of multiple flags, Fl is a numeric 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 F
l indicates an equal key flag, respectively. Control circuit (
1) is configured to perform arithmetic processing by exchanging data between a data memory (4) storing input data, a display memory (13), and a register (14) according to a program in a program memory (3). ing.

Next, the operation of the present invention having such a configuration 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, when the "ON" key on 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 stage display (10) of the display (6). " is displayed. In this state, the control circuit (1) is connected to the keyboard (2).
) is checked which key was pressed, and when the first number "5." is entered on the keyboard (2), the control circuit (
1) 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 (13b) of the display memory (13). (See Figure 12C).

Next, when the "1+" 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 at the same time, the data memory (4) After checking whether it is full or not, register (
Data r5. Write.

At the same time, the address data "01" and numerical data "5" are transferred to the area (13c) of the display memory (13). Therefore, address data "01" and numerical data r5" are displayed on the third row on the display (6). Then, an addition operation is performed between the value of the operation result register (14c), in this case "0", and the constant register (14b), and the operation result is stored again in the operation result register (14c).

Thus, upon operation of the "+" key, the control circuit (1) performs this amount of processing and returns to the next key waiting state. At this time, the control circuit (1) stores the data memory (4) in the registers (14e) (14f). The maximum address data of the display memory (13), ie, "01" is written (see FIG. 12C).

Then, when "3" is entered, the number register (14
F3.a) and the area (13d) of the display memory (13). (see FIG. 12C).

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) and writes the data to the address added by 1. Therefore, "3" 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.
Moved one step. Then, the value 15 of the operation result register (14c) is added to the value 3 of the constant register (141+), and the operation result is added again to the operation result register (14c).
).

From now on, if you enter the information sequentially from the keyboard (2),
As shown in FIG. 12E to FIG. 12I, the control circuit (1)
When the equal key (2g) is finally 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 and the data in the constant register (14b) is added to the calculation result register (14c), and the calculation result is inputted into the calculation result register (14c) again. 13d). Therefore, the calculation result is displayed on the fourth stage of the display (6) (see FIG. 12C).

The display memory (13) is configured so that when it becomes full and new data is input, the oldest data is erased. When the data at address 04 is displayed, as shown in Figure 12H, Data is deleted and the display is scrolled. Similarly, at the end of the calculation, the 12th ry! J
As shown in J, address 01.02 has been deleted.

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 is lit. 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 (
When 2c) is operated, the state shown in FIG. 13 is reached, and the calculation result 16" 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 have been displayed and addresses Ol and 02 have disappeared, operate the scroll key (2f) to display the data at addresses 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 areas (13a) to (13c) of the display memory (13) one stage downward, empties the area (13a), and then displays the data in the save register (14d). memory(
13) to the area (13a) to create the state shown in FIG. 14A. Therefore, on the display (6>), the data disappears at address 05, the data at addresses 02 to 04 is displayed, and the display is scrolled one step.This causes the control circuit (1) to memorize the maximum address of the display memory (13). register (14f)
The data is rewritten to "04" and compared with the value of the register (14e) storing the maximum address of the data memory (4). The data memory (4) currently stores data up to "05., and the maximum displayed is r04", which is more of an excuse, so the control circuit (1) lights up the symbol (11) on the display (6). to indicate that data is stored in the data memory (4) in addition to what is displayed. 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 first to third input data can be confirmed on the display (6).

After confirming the input up to the third input in this way,
In order to see the input data, this time use the scroll key (
2e), the control circuit (1) detecting the scroll key signal checks whether the correction flag (F6) is set. 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 address “o4°” of the data memory (4) which has been incremented by 1 and transferred to the save register (14d). After shifting the data up one stage, it is transferred from the save register (14d) to the display memory (13
) data is transferred to the area (13c). At this time, the register (14f) is changed to "04", and the register (14f) is changed to "04".
By comparing e) with the value of register (14f),
The symbol (11) is lit in the same manner as described above. In this way, the state shown in FIG. 14A is reached, and the data "r04" is displayed, allowing the fourth input data to be confirmed. Next, by operating the scroll key <2e) again, the fifth data can be displayed in the same manner 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 keys (2e) (2
The display can be scrolled arbitrarily by the operation f), and input data can be easily confirmed.

(G) Effects of the Invention As described above, when the electronic desk calculator of the present invention stores input data in the memory and sequentially reads and displays the input data after the calculation is completed, the data stored in the memory after the data displayed on the display is If the data is stored in memory, a symbol indicating it is lit, making it easier to determine whether or not there is data in the memory when reading and displaying data, improving operability. It is something.

[Brief explanation of the drawing]

FIG. 1 is a block diagram showing the configuration of the electronic on-board calculator of the present invention, FIG. 2 is a diagram showing the configuration of the liquid crystal display shown in FIG. 1, and FIG. 3 is a diagram showing the configuration of the keyboard shown in FIG. 1. , FIG. 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.
FIGS. 8, 9, 10, and 11 are flowcharts showing the operating states of FIG. 1, FIGS. 12A to 12J,
FIG. 13, FIG. 14A, 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 the input data, a calculation means for performing calculations based on the input data, and a display means for displaying the input data and calculation results. a reading means for sequentially reading out the data stored in the data memory and displaying it on a display means; a means for detecting whether data subsequent to the data displayed on the display means is stored in the memory; An electronic desk calculator characterized by being provided with an instruction means for instructing when it is detected that data is stored in a memory.