JPS5911946B2 - Operation specification method - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to an operation designation method that enables selective switching and designation of arithmetic functions in an electronic desktop calculator having a plurality of types of arithmetic functions.

Recently, electronic desktop calculators have been developed that have various arithmetic functions such as square root calculation, n-th power calculation, conformal function calculation, period calculation, due date calculation, and interest rate calculation in addition to the simple four arithmetic calculation functions. It has been put into practical use.

In this type of electronic desktop calculator, the calculation specification method for selecting and specifying various calculation functions and executing them is, for example, by providing the same number of function keys as the number of types of calculation functions. In some cases, one arithmetic function corresponds to one function key.

In such devices, the number of function keys increases as the number of calculation functions increases, resulting in extremely large shapes, a high probability of incorrect key operations, and high prices. It has to become something. Another method for specifying calculations is to specify two calculation functions to be executed in one
For example, an "extra" key is provided, and the "extra" key is pressed before the function key is pressed. This is a so-called double function function in which the function key is selected depending on whether the function key is pressed or not.
A method has been developed.

However, even in this method, the types of calculation functions that can correspond to one function key are limited to two types, so as the types of calculation functions increase, the number of function keys must also increase. 5 function keys
This method has drawbacks such as the need to pay attention to whether or not to press the "extra" key before pressing the "extra" key. This invention has been made in view of the above points, and in order to selectively switch and designate the arithmetic function to be executed in advance and to command the start of execution of the arithmetic function, it is necessary to use a common function for all the arithmetic functions. By making it possible to start execution simply by operating one common function key, the operation for executing an operation can be extremely simplified, and an operation specification method that can be made smaller and less prone to erroneous operations is provided.

An embodiment of the present invention will be described below with reference to the drawings.

1 is a hexadecimal counter circuit, for example, and this counter circuit 1
counts clock pulse signals supplied from a control unit 10, which will be described later, and outputs the counted value in a 3-bit configuration.

2 is a decoder circuit, the count value output signal of the counter circuit 1 is supplied to this decoder circuit 2, and its output terminal 21
, 22, 23...26 to scan signals Sl, S2...
It is configured such that S6 is obtained sequentially in accordance with the count value of the counter circuit 1.

Reference numeral 3 denotes an operation selection section, and this operation selection section 3 is composed of, for example, a slide switch provided on the keyboard of an electronic desk calculator, and the respective positions on the keyboard corresponding to the fixed contacts 31, 32, . . . , 36 are are marked with characters, symbols, etc. indicating calculation functions; for example, the fixed contact 31 is marked with "An" indicating n-th power calculation, and the fixed contact 32 is marked with "DATE" etc. indicating date calculation. , the fixed contact 33 is marked with a mark such as "f" indicating square root calculation, and the other fixed contacts are also marked with necessary characters, symbols, etc.

These fixed contacts 31, 32...36 are supplied with scanning signals Sl, S2...S6 from the output terminals 2, 22...26 of the decoder circuit 2, respectively. The fixed contacts 3, 32, . . . , 36 correspond to the respective counts 1, 2, . . . , 6 of the counter circuit 1, respectively. Reference numeral 37 denotes a movable contact, and by setting the movable contact 37 at a desired fixed contact position, an operation for selecting and specifying an arithmetic function is performed.

That is, the movable contact 37 is supplied with a scanning signal corresponding to the calculation function of the set fixed contact. 41, 42, 43
is an and gate, and these AND gates 41, 42,
43 is supplied with bit signals constituting each count value of the counter circuit 1 and a scanning signal from the decoder circuit 2 obtained via the movable contact 37. The obtained start signal for instructing the start of execution of the calculation is supplied.

The output signals from the AND gates 41 , 42 , 43 are supplied to an address decoder 6 , and the address decoder 6 converts the output signals from the AND gates 41 , 42 , 43 into address signals and supplies them to the address register 7 . Reference numeral 8 denotes a fixed program storage device (hereinafter referred to as a ROM unit) that permanently stores programs for executing various arithmetic functions.
, 22, . . . , 26 are stored at positions whose start addresses are the count values of the counter circuit 1 corresponding to the respective fixed contacts.

When the ROM unit 8 is supplied with an address signal from the address register 7, it reads into the instruction register 9 the instruction (one-step instruction) stored within the address specified by the address signal. This control unit 10 decodes the instructions in the instruction register 9 and executes the instructions stored in the instruction register 9 to the arithmetic unit 11 that performs various operations. generates the necessary control signals.

The control unit 10 also updates the address of the ROM unit 8 by supplying an increment signal etc. to the address register 7 in order to execute the next step instruction. The control unit 10 not only generates control signals according to the program from the ROM unit 8, but also generates various functions 12 that are the same as those of a normal electronic desktop calculator.
A control signal is also generated by a signal from the computer, and numerical information necessary for calculation is input to the calculation unit 11 through a numerical input section 13.

These control unit 10, arithmetic unit port 1, function key part 12, numerical input part 13, etc. are constructed using completely conventional techniques, and detailed explanations thereof will be omitted. The operation of this embodiment with the above configuration can be performed using square root calculation, for example /
The calculation will be explained as an example.

First, the variable contact 37 of the calculation selection section 3 is set to the fixed contact 33 corresponding to the square root calculation. This allows AND gate 4
1, 42, and 43, in addition to the count value output signal from the counter circuit 1, a scanning signal S3 obtained via the fixed contact 37 (the timing at which this scanning signal S3 is obtained is determined by the count value of the counter circuit 1 is 31) is supplied.Next, when the numerical value ``5n'' is input from the numerical input section 13,
This numerical value "51" is supplied to the arithmetic unit 11. If the S key 5 is operated here, the operation signal from the S key 5 will be supplied to the AND gates 41, 42, and 43.
AND gates 41, 42, and 43 are the count value ゛011 of the counter circuit 1 at the timing when the scanning signal S3 is obtained.
1 (binary representation) is supplied to the address decoder 6. Therefore, the address register 7 supplies an address signal corresponding to "0111" to the ROM unit 8 to designate the start address of the program for performing square root calculation.The one-step instruction stored in this start address is read out to the instruction register 9, decoded by the control unit port 0, and a control signal is supplied to the arithmetic unit port 1.The control unit 10 reads the instruction to the address register 7 in order to execute the next step instruction. An increment signal is supplied to specify the next address in the ROM unit 8. In this way, the program for square root calculation is sequentially executed in the calculation unit 11, and the calculation of Δ is performed.The calculation result is displayed on a display (not shown). In the embodiment described above, the operation selection section 3 is a slide switch, but it is obvious that it can also be configured with a rotary switch, etc., and the number of fixed contacts of the operation selection section 3 is determined by The number of functions can be increased or decreased arbitrarily according to the number of functions, the specific contents of the calculation functions can be changed variously as necessary, and other circuit configurations can be variously modified without departing from the gist of the present invention. Of course.

As explained in detail above, the present invention provides an electronic desktop calculator having multiple types of calculation functions, which selectively specifies the calculation function to be executed among the plurality of types of calculation functions, for example, from a slide switch. an arithmetic selection switch, a counting means for counting a value corresponding to the type of arithmetic function for detecting the switching position of the switch, a decoding means for decoding the contents of the counting means to generate a timing signal, and an arithmetic operation and a single key for instructing the execution of a calculation for a function, and when the key is operated, the counting contents of the counting means are set as a leading address at a timing corresponding to a switching position of the calculation selection switch, and addressing means is provided. Since the selected operation is executed by introducing the
It has various advantages, such as being able to reliably prevent erroneous operations, being implemented with a simple circuit configuration, and contributing to miniaturization of electronic desktop calculators.

[Brief explanation of the drawing]

The figure is a circuit system diagram showing the entire circuit configuration of an embodiment of the present invention. 1...Counter circuit, 3...Calculation selection section, 5..."S" key, 8...ROM
Unit, 10...Control unit.

Claims (1)

[Claims] 1. In an electronic desktop calculator having multiple types of calculation functions, a calculation selection switch that selectively switches a desired calculation function among the plurality of types of calculation functions, and a calculation function that counts a value corresponding to the type of calculation function. a decoding means for decoding the counting contents of the counting means to generate a timing signal corresponding to the counting contents and applying the timing signal to the calculation selection switch to detect a switching position; A storage means for storing a program for executing a function, an addressing means for specifying an address of the storage means, an arithmetic means for executing a program of the storage means designated by the addressing means, and the arithmetic operation. a single key for instructing the execution of calculations for functions;
means for inputting the counted contents of the counting means into the addressing means at a timing corresponding to the switching position of the calculation selection switch when the key is operated, and setting the address by the calculation selection switch. An operation specification method characterized in that the operation function selected by the key is executed by operating the key.