JPS59100965A - Electronic device - Google Patents

Abstract

PURPOSE:To perform the input/output in response to the types of plural variables or parameters by providing an instruction key to deliver the variable used for function operation in a multiple style. CONSTITUTION:An output device 7 which delivers the input value or the arithmetic result of a display device, a printer, etc. is connected to a microcomputer 5. An input key 1 consisting of numerical keys and operation keys for four rules of arithmetic and function keys 2-4 are connected to an input device. A flip- flop 6 which shows the numerical input state to an arithmetic register is connected to a microcomputer 5. The function key 4 (Y key) designates the conversion processing. For calculation of money rates, the annual interest is converted into the monthly interest in an input mode by the Y key. In addition, the monthly interest can be converted into the annual interest with the arithmetic result.

Description

DETAILED DESCRIPTION OF THE INVENTION Technical Field The present invention relates to electronic equipment, and more particularly to electronic equipment such as an electronic desktop calculator that can perform specific functional operations.

Conventional technology Traditionally, electronic desktop calculators (hereinafter referred to as calculators) have been used.

) and other electronic devices are known to have a function to calculate interest rates for loans and the like.

There are various methods for calculating interest rates, such as monthly interest rate, annual interest rate, and daily interest rate, but conventional electronic devices such as calculators can only input and output the annual interest rate using one type of method: annual interest rate. There are many practical inconveniences.

This problem of limited input/output formats exists not only in interest rate calculation functions, but also in electronic devices with other special calculation functions. For example, in a calculator with a biorhythm calculation function, there is the issue of whether to use the Western calendar or era name for dates.

the purpose The present invention has been made in view of the above points, and has multiple aspects.

EXAMPLES Hereinafter, the present invention will be explained in detail based on examples shown in the drawings. However, in the following embodiments, a calculator with an interest rate calculation function will be described in detail as an embodiment.

FIG. 1 is a block diagram of a calculator employing the present invention, which has a microcomputer 5 as an arithmetic unit. The microcomputer 5 is a known one consisting of a CPU, ROM, RAM, etc., and is configured as a one-chip LSI. The microcomputer 5 is connected to an output device 7, such as a display device or a printing device, for outputting input numerical values or calculation results.

As input devices, input keys 1 and function keys 2, 3, and 4, each consisting of numerical and arithmetic operation keys, are connected to the microcomputer 5.

Furthermore, a flip-flop 6 is connected to the microcomputer 5, which indicates whether or not a numerical value has been input to the arithmetic register.

Function key 3 is a function key related to interest calculation, PV is principal key, FV is principal and interest total key,
i is the interest rate key and N is the period child. These keys store the numerical value in the register for each variable provided in the microcomputer 5 by pressing each key after entering the number using the numerical keys, and after pressing the function key 2, each of the above functions By pressing any of the keys, calculations and outputs for each key are performed. Further, function key 4 (Y key) is a key for specifying a conversion process to be described later.

The operation in the above configuration will be described in detail below.

In the present invention, the annual interest rate is converted into a monthly interest rate at the time of input, and the calculation result is provided with a function of converting the monthly interest rate into an annual interest rate.

Now, the monthly interest rate is im%, the period (number of months) is Nm, and the principal is P
v. If FV is the total principal and interest compounded monthly after the period has elapsed, then there is the following relationship. That is, if three variables out of the four variables are known, the other one variable can be found from the above equation.

Regarding the interest rate, if the annual interest rate is iy%, iy = 12X
im, so at the time of input, the conversion of im=iy/12 is performed, the monthly interest rate is calculated in the arithmetic processing, and the conversion processing is performed using the formula iy=12Xim in the output processing.

In the present invention, the above conversion process is performed using the Y key.

Next, operations related to the operation will be explained with reference to FIGS. 2(A) and 2(B).

FIG. 2(A) shows key operations and corresponding output device 7.
This shows an example of the output that is output. This figure shows the conversion operation when an interest rate is input, and shows the processing when an annual interest rate of 12% is input and stored in the interest rate register of the microcomputer 5.

In FIG. 2(A), first, ``12'' is entered using the numerical keys. This represents "annual interest rate of 12%", the % sign is omitted, and output processing is performed on the output device 7 in accordance with the entered number.

At the same time as this number is set, the flip-flop 6 is set, and the function key can be pressed.

Next, if you press the Y key in this state, the previous i m = i
The monthly interest rate is converted according to the 712 formula, and the result is 1 (=12/12).

Next, when the 1 key is pressed, "l" (monthly interest rate of 1%) is stored in the interest rate register of the microcomputer 5.

In order to input the monthly interest rate in the above input operation, the numerical value of the monthly interest rate can be entered directly using the numeric keys and stored using the i key. Other variables are stored in their corresponding registers by input operations that do not use the Y key.

For example, Nm (period) - 24, PV (principal) = 1 - 00
00, and press these numbers by pressing the corresponding Nm key,
Store in each corresponding register using the PV key.

Next, press the function key 2 and the FV key in succession.According to formula (1), the total principal and interest FV is 12[i9? ,3
465 (in the case of lO-digit output), and this numerical value is output to the output device 7.

Next, FIG. 2(B) shows the operations and operations when outputting interest rates.

F V = 12697.34Ei5, PV = 1000
0. After inputting and storing Nm=24 in the same manner as above, if you press the function key 2 and the i key in succession as shown in the figure, "1" (1% monthly interest rate) will be output according to formula (3). . This monthly interest rate is stored in the calculation register at the same time, so flip-flop 6 is set, and then when the Y key is pressed, conversion is performed according to the iy=12Xim formula, and r12J (annual interest rate of 12%) is output. .

In the above example, the annual interest rate to monthly interest rate is converted,
N (period) may be converted from the number of years to the number of months. Furthermore, conversion from Western calendar to era name can be performed not only in interest rate calculations but also in biorhythm calculations and the like. It goes without saying that the configuration described below can also be applied to electronic devices other than calculators.

Effects As is clear from the above explanation, according to the present invention, an electronic device capable of performing specific function calculations has a configuration in which a command key is provided to output variables in multiple formats. It is possible to provide an excellent electronic device that can perform variable output.

[Brief explanation of the drawing]

FIG. 1 shows blackflies 2 of the electronic device of the present invention. Fig. 2 (A
) and (B) are explanatory diagrams illustrating the operation of the electronic device of the present invention. 1... Input key 2, 3, 4... Function key 5... Microcomputer 7... Output device

Claims (1)

[Claims] What is claimed is: 1. An electronic device capable of performing a specific functional operation, characterized in that the electronic device is provided with a command key for outputting variables used in the functional operation in a plurality of formats.