JPS5949614B2 - Date display method - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a small electronic device having a date display function suitable for calculating the number of days using a desktop computer, for example.

Recently, desk-top electronic computers have been used in various fields, and computers suitable for use in each field have also been developed.

For example, banks want a calculator that can calculate the number of days for calculating interest. In order to calculate the number of days, it is necessary to store so-called calendar information such as the year, month, day, day of the week, etc. as input numbers or calculation results in a register and to display it on a display device. When displaying the above calendar information, it is difficult to confirm the displayed calendar information such as the year, month, and day if the numbers are displayed in a list. In this case, a numbering error may occur. The purpose of the present invention is to
To provide a small electronic device having a date display function capable of storing calendar information such as the date and day of the week in a register and displaying the calendar information in an easy-to-see form on a display device.

Hereinafter, the present invention will be explained in detail with reference to the drawings.

In FIG. 1, 1 is a shift register, and in this shift register, by pressing one of the ticks of numeric key 2, numerical information is transferred to the minimum position through OR gate 3, AND gate 4, and OR gate 5. Entered in digit position. The AND gate 4 is opened by the least significant digit pulse LSD from the timing generation circuit 6.

Numerical information input to the shift register 1 is circularly shifted from the least significant digit position to the most significant digit position via the AND gate TN OR gate 8, AND gate 9, and OR gate 5 in the usual manner.
The output of the OR gate 5 is decoded by a decoder 10 and dynamically displayed by a display device 11. Number key
When the numeric key is pressed continuously in step 2, a digit shift command signal is generated from the control unit 12, which is a signal indicating that the date key described later is not pressed, that is, a normal numeric value operation. Since the AND gate 13 is opened by the signal B and the digit shift command signal, the contents of the shift register 1 are 1.
Since it is shifted through the delay circuit 14, the AND gate 13, and the OR gate 5, it is shifted to the left by one digit, and the AND gate 4 is opened by the LSD from the timing generation circuit 6, so that the new numerical information is Stored in the lowest digit position of register 1. At this time, an output is generated in the AND gate 14 by the digit shift command and the normal digit signal B, and this output is inverted by the inverter 16 via the OR gate 15, so that the AND gate 7 is closed. That is, the normal circulation shift path of the shift register 1 is blocked. In this way, a normal number setting operation is performed. For example, if you operate the numeric keys in the order of ``1'', ``9'', ``7'', and ``5'' on the numeric key 2, the normal numeric value operation will be performed as shown in Figure 2 (4). In agreement with this, the year information "1975" is stored in the register 1 and displayed on the display device 11.

Next, after storing the year information, it is necessary to store the month information.

In the present invention, the date key 17 is used before storing the piece of information.
operate. The number of operations of the date key 17 is stored by a ternary counter 18, from which signals indicating the first, second and third operations of the date key are respectively taken out and supplied to the OR gate 19. Therefore, when the output of this OR gate 19 is A/)S01, the date key is
17 is operated. Output A is inverter 20
given to. Therefore, the output B of this inverter 20 is 6
1'', that is, the output A75S00'' of the OR gate 19 indicates that the date key 17 is not being operated, that is, a normal number entry operation is being performed.
This is the first date key operation after storing the year information, and therefore a signal indicating the first operation is taken out from the ternary counter 18, and this signal causes the subtraction counter, which normally holds the content of zero, to be activated. For example, the contents of 21 are preset to 8.

This counter 21 is decremented by 1 by a clock signal generated every one word time (the time required for the contents of the shift register 1 to be circularly shifted once). counter 2
The content of 1 is detected by the numerical value detector 22, and when the value is other than zero, it outputs 01゜. The 61° output is applied to AND gate 23 to open this gate, and is also applied to AND gate 7 via OR gate 15 and inverter 16 to close this gate.

Further, since there is no digit shift instruction at this time, AND gates 13 and 24 are closed. Therefore, the contents of the shift register 1 are circulated through the delay circuit 14, the AND gate 23, the OR gate 8, the AND gate 9, and the OR gate 5. This circular operation continues until the contents of the counter 21 become zero, so the previously stored year information is shifted eight digits to the left. At this timing of the LSD during operation, a blanking code other than the numerical value supplied from a blanking code generator (not shown) is output to the AND gate 25.
Since the blanking code is stored in the register 1 via , the blanking code is displayed after the year information as shown in FIG. 2B. Non-numeric information as a blanking code,
For example, it may be a decimal point or a minus sign. Or, it may not be necessary to display anything. The contents of register 1 as shown in FIG. After the year information has been shifted eight digits to the left in this way, it is necessary to store the month information in register 1.

With the date key 17 operated once, if you press the numerical key corresponding to month information, for example, the numerical key C if you want to store June, the timing signal generation circuit 6 as shown in FIG. A digit pulse T5 corresponding to the fifth digit of register 1 is generated to open AND gate 4. At this time, no digit shift instruction occurs, so AND gates 13 and 2
4 will never open. Therefore, the information of 6 is stored in the shift register 1 via the OR gate 5 and displayed at the fifth digit from the lowest digit as shown in FIG. 2C. The blanking code that has already been stored in this position is activated by the digit pulse T6 when the AND gate 4 opens.
Since the AND gate 9 is closed by applying the signal to , the signal is erased. From then on, the contents of register 1 will be the second
As shown in FIG. C, it is cyclically shifted through a normal circulation path and displayed on the display device 11.

If there is a blank digit, that is, a blanking code, between the year information and the month information, it becomes very easy to read.

There are two types of month information: one-digit and two-digit.

In the case of l digits, the above explanation is sufficient, but below we will explain the case of 2 digits. When the date key 17 is operated for the first time, the digit pulse T5 from the timing generation circuit 6 and the output of the ternary counter 18 are used to output the signal to the cyand gate 27.
1° is produced, and this output sets the flip-flop circuit 29 via the OR gate 28, making its output 0°. The reset input of this flip-flop circuit 29 receives the above-mentioned clock signal ψ. is given, and the output becomes 01'' at the end of one word period.This flip-flop circuit 2
The output of 9 is supplied to a one-digit time delay circuit 30 and the output T
produces E. This output TE is at 0bi at least while the digit pulse T6 is present. As mentioned above, the first digit of the month information is stored in the fifth digit of the register when the digit pulse T5 is present, and when the second digit is subsequently stored, a digit shift command is first generated by the control unit 12. As a result, AND gate 7 is closed and AND gate 24 is opened. Therefore, when there is a digit pulse T5 in which the content of the fifth digit (the first digit of the month information) is stored in the delay circuit 14, the value of the second digit of the month information is stored in the register 1 via the OR gate 5. Ru.
When the digit pulse T6 exists, the output TE of the delay circuit 30
Since the AND gate 24 is opened, the first digit of the month information is returned to the register 1 while being shifted one digit to the left. In this case, the digit pulse T and thereafter TE become ``'02'', and the AND gate 24 is closed, so the year information is shifted through the normal circulation path, so there is no digit shift.In this way, the year information is , the second date key operation is performed to store the date information after the month information has been entered.

After the second operation of the date key, the least significant digit pulse LSD is taken out from the timing generation circuit 6, so the date information 1
For example, the 1 for the 13th digit is stored in the lowest digit position as shown in FIG. 2D. In this case, the blanking code already written at this position will be erased because the output of the inverter 26 is 007 and the AND gate 9 is closed at the timing when the LSD occurs. When operating date key 17 for the second time, press 3.
Output of advance counter 18 and output L of timing generation circuit 6
An output 61' is produced at the AND gate 31 by SD and this output sets the flip-flop circuit 29 via the OR gate 28.

In this case, the output TE of the delay circuit 30 is 61'' when at least the digit pulse T2 is present.Next, when the key of number 3 is pressed, the output TE of the delay circuit 30 is 61''. The contents of 3 are stored in the least significant digit position of the register.At this timing, AND gate 9 is closed, so the already stored value of 1 is not fed back to the input side of register 1 and is delayed. It is held in the circuit 14. Next, the digit pulse T
When 2 exists, AND gate 9 is opened, but
The output TE produces an output 012 in the AND gate 32,
This output closes the AND gate 7. On the other hand, since the AND gate 24 is opened, the contents of the delay circuit 14 are returned to the register 1 via the AND gate 24 and the OR gate 5 at the time of generation of the digit pulse T2. In this way, the two-digit day information is displayed with the month information and blanked digits in between, as shown in FIG. 2E. In the above manner, it is possible to store and display the year, month, and day information in the register in an easy-to-read format, but for example, what day of the week is the year, month, and day stored by the third date key operation? can be calculated.

That is, by giving the output of the ternary counter 18 indicating the third operation of the date key to the calculation unit 33, the calculation unit 3
The day of the week of the year, month, and day stored in the register can be calculated from the reference year, month, and day stored in 3 and the day of the week. At the end of the calculation, by generating a signal indicating the completion of the calculation and giving it to the timing generation circuit 6, the day of the week data from the calculation unit 33 is sent to the OR gate 3, AND gate 4, and OR gate 5 at the time when the most significant digit pulse MSD is generated. Day-of-the-week data can be stored in the lowest digit position of register 1. In FIG. 2F, day of the week data is shown numerically at the most significant digit position. Each day sign has a specific number, for example Sunday 1.
By assigning "O", Monday - "1", . . . Friday - "5", Saturday - "6", it can be easily determined which day of the week it is. In the case of days calculation, if further calculations are performed between the calculation results of the first date and the reference year, month, and day, and the calculation results of the second date and the reference year, month, and day, The number of days between the first date and the second date can be easily determined.

Next, the timing generation circuit 6 will be explained with reference to FIG.

A signal indicating a normal number operation, that is, an output signal B of the inverter 20 indicating that the date key 17 is not pressed, and an output signal of the triple counter 18 indicating the second date key operation are transmitted via an OR gate 34 to an AND gate 35. given to. This AND gate 35 has a minimum digit pulse LSD.
and a numeric signal indicating that numeric key 2 has been operated. The AND gate 36 is supplied with a signal from the ternary counter 18 indicating the first operation of the date key 17, a digit pulse T corresponding to five digits of the register, and a digit signal.
The AND gate 37 is supplied with a signal indicating the end of the day of the week calculation and the least significant digit pulse MSD. The outputs of these AND gates 35, 36, and 37 are applied to an AND gate 39 via an OR gate 38. A digit shift command signal is applied to this AND gate 39 via an inverter 40. Therefore, AND gate 39 does not produce an output when the digit shift command signal is present, and LSD, T5, MSD at each stage when the digit shift command signal is not present.
produces one of the following outputs: The output of OR gate 38 is applied to AND gates 27 and 31. Inquiry, digit pulse T1 (LSD), T2...T5...■ (MSD)
are sequential pulses that are generated according to the number of digits in the shift register 1, and each word period is one cycle.

Further, it is not necessary to provide a special date key; for example, by hitting the decimal point key twice, it can function as a date key. In the Kondoki example, when calendar information such as year, month, day, etc. is stored in a register, a portion for storing each information such as the year, date, etc. is predetermined in the register. We took an example of so-called fixed storage and showed its display mode, but by applying appropriate control, the storage portion of each information in the register 9 can be stored in a variable length according to various forms of the calendar information. As a form of display, each piece of calendar information is separated and displayed by intervening at least one digit delimiter, for example, a blank, a decimal point, a symbol such as a "-" sign, etc. Of course you can get it.

Further, in the above embodiment, the Western calendar is used as the year information, but it goes without saying that the year name (or era name) may also be used. As mentioned above, the present invention can calculate the year, which is necessary for calculating the number of days, etc.
Calendar information such as month, day of the week, etc. can be displayed by placing blank digits between each piece of information, and therefore calendar information such as year, month, day, day of the week, etc. can be displayed easily. This can prevent errors in entering calendar information. In addition, since calendar information is entered using one calendar key, key operations are easy.Furthermore, when the calendar key is operated a predetermined number of times, day of the week calculations are automatically performed, so Another advantage is that no special key is required for operation instructions.

[Brief explanation of the drawing]

FIG. 1 is a diagram showing an example of a system diagram for implementing the date display method of the present invention, FIG. 2 is a diagram for explaining the date display method of the present invention, and FIG. 3 is a diagram similar to that of FIG. FIG. 2 is a logic circuit diagram showing an example of a timing generation circuit.

Claims (1)

[Claims] 1 Contains numerical keys for inputting calendar information such as year, month, day, etc., a calendar key for distinguishing each piece of the above calendar information, and a single counting circuit, which counts the number of operations of the above calendar keys. a register for storing each calendar information entered by the numeric keys operated prior to the operation of the calendar key; It comprises a control means for separating each piece of information of the calendar information by a predetermined digit and storing it in the register, and a day-of-the-week calculation means for performing a day-of-the-week calculation on the calendar information when the count value of the counting means reaches a predetermined value. A small electronic device having a date display function, characterized in that each piece of the calendar information is displayed separately.