JPS6015038B2 - Month and day determination method in electronic watches - Google Patents

Description

[Detailed Description of the Invention] The present invention relates to an electronic clock that can digitally display the month and day, and has a month and day judgment method that automatically switches to the 1st of the next month when a specific number of days have passed for each person. It is related to.

In recent years, in electronic clocks that can display the month and day, even if the number of days in the month is different from 31st (large month), 30th (small month), 28th, or 29th (February), A device that can automatically determine the number of days and automatically switch the number of days for each person is being considered.

However, since it is extremely difficult to determine the month and date, the conventional month and date determination circuit has a very complicated circuit configuration, which is one of the obstacles to miniaturizing the device and reducing costs. Also, the ROM can be stored using microinstructions.
If you want to determine the date of a month, such as a large month or a small month, by storing the large month, small month, leap year, etc. for each month in advance, and then checking which month the desired month belongs to and whether it is a large month. It is necessary to determine for each month whether it is a month of month or month of month of month, etc., which has the disadvantage that the number of processing steps for the determination increases and the processing time also increases.

The present invention was made in view of the above circumstances, and an object of the present invention is to provide a method for determining the month and day in an electronic timepiece that can easily determine the number of months and days using a circuit with a simple configuration and can be constructed at a low cost. It is something to do.

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

FIG. 1 is a block diagram showing the overall configuration of a timepiece incorporating a circuit to which the discrimination method of the present invention is applied. In the figure,
For example, using a crystal oscillator, a reference clock signal generated from an oscillator 1 is converted into one pulse signal per second in a frequency dividing circuit 2, and then sent to a timekeeping circuit 3 consisting of an hour, minute, and second counter circuit. Supplied. The binary hour, minute, and second information obtained by the clock circuit 3 is converted into decimal hour, minute, and second information by the decoder 4.
The hours, minutes, and seconds are changed to second information and displayed on the display 5 in decimal numbers. The time signal of the clock circuit 3 is AM/PM (A
A binary counter 6' for indicating M/PM) is sent, and a carry signal of this binary counter 6 is sent as a day signal to a day counter 8 in 31-decimal notation via a gate circuit 7. The contents of the morning/afternoon counter 6 and day counter 8 are also sent to the display 5 via the decoder 4, and the morning/afternoon distinction and the number of days are displayed as necessary. Therefore, the carry signal of the day counter 8 is sent as a self-signal to the decimal month counter 10 via the gate circuit 9, and the contents of the month counter 10 are also sent via the decoder 4 to the display 5 as necessary. displayed accordingly. The carry signal of the month counter 10 is sent to the leap year discrimination circuit 11 as a year signal. The leap year discrimination circuit 11 is, for example, a quaternary counter, and is configured to output a carry signal in a leap year that occurs once every four years. Block 12 in FIG. 1 is a month/day discrimination circuit according to the present invention, which includes the output of the AM/PM counter 6, the number of days data of the day counter 8, and the month number counter 10.
The month number data and the output data of the leap year discrimination circuit 11 are inputted. Month and day number determination circuit 12
first determines whether it is February from the input month data, and if it is February, based on the output data of the leap year discrimination circuit 11,
In a normal year, the midnight signal issued on the 28th increments the contents of the month counter 0 to 11 via the gate circuit 9, and resets the day counter 8 and sets it to "1".
If it is a leap year, the midnight signal issued on the 28th increments the contents of day counter 8 to 11, and the next midnight signal advances the month number by one and sets the day counter to "1". control. Furthermore, if the input month data is for a month other than February, it is first determined whether it is greater than or equal to August or less than August. If it is the end of August, then odd numbered months are considered large months, and even numbered months other than February are considered small months, and if it is over August, even numbered months are judged as large months, and odd numbered months are judged small months. .

This is clear from Table 1 below, except for February, the months less than August are odd-numbered months, that is, January, March, May, and July are major months (31 days), June is a small month (30 days), and months of August and above are even-numbered months, i.e. August, October, 12
This is due to the fact that the odd-numbered months, namely September and November, are large months (31 days) and small months (30 days).
In this way, by dividing the month into August, it becomes very easy to determine the month and day. However, Table 1 shows the case of a normal year. Table 1 Here, in order to summarize the above-described month/day discrimination method of the present invention, a step-by-step explanation will be given with reference to the flowchart of FIG. 2.

It is determined whether the input month data (the contents of the month counter) is for February, and if it is February, it is determined in the next step whether the contents of the day counter are the 28th or the 28th. If it is the 28th, then on the condition that it is not a leap year, the contents of the months counter are set to 11 and at the same time the contents of the days counter are set back to 1.

If it is a leap year with 28 days, the contents of the days counter will be incremented by 11.

If the content of the days counter is not the 28th, it is determined whether or not it is the 29th, and if it is the 29th, the content of the month counter is set to 11 and at the same time the content of the days counter is returned to 1. 29
If it is not a day, just add 11 to the contents of the days counter.

In this way, when the content of the input month data is February, the number of months and days is determined depending on whether it is a leap year or not. When the contents of the input month data are not February, it is first determined whether the month ends in August or is longer than August.

When the end of August is full, it is determined whether the contents of the month counter are an odd number or not. If the number is odd, it is determined whether the contents of the day counter are 31 or not.
It is determined whether it is a day or not.

If the end of August is an odd number, the monthly output will be output on the 31st, and if it is an even number, the monthly output will be output on the 30th.

If it is August or more, it is determined whether it is an odd numbered month or not, and as a result, if it is an even number, the month is 31st, and if it is an odd number, it is the 31st.
The monthly determination output is controlled to be output on the 0th day.

Next, the specific configuration of the month/day discriminating circuit 12 shown in FIG. 1 will be explained using the embodiment shown in FIG.

In FIG. 3, input monthly data from month counter 10 is supplied to the input terminals of AND gates 21, 22, and 23. The AND gate 23 is a February discrimination gate, and when the input month data is February, an output is output from the AND gate 23 and A
It is applied to ND gates 24 and 25. AND gate 23
The output of is connected to AND gates 21 and 2 via an inverter
2, the outputs of AND gates 21 and 22 are prohibited and do not come out during the month of February. The output of the leap year discrimination circuit 11 is directly input to the AND gate 24.
The signal is input to the AND gate 25 via an inverter 27. In this state, the output of day counter 8 is normally 2 in a year.
8th, AND gate 29 via OR gate 28
When the carry signal of the binary counter 6 indicating midnight is input to the other input terminal of the AND gate 29, an output is output from the AND gate 29, and this output causes the day counter to The contents of 8 are reset and preset to ``1'', and the contents of month counter 10 are incremented by 11 through gate 9 to become 3. Also, in a leap year, when the content of day counter 8 is 29, AN
When the carrier IJ- signal of the binary counter 6 indicating midnight is input to the other input terminal of the D gate 29, "1" is input to one input terminal of the AND gate 29 from the AND gate 24 via the OR gate 28. ``Since the signal is applied, outputs for changing the month and number of days are similarly obtained from the AND gate 29. On the other hand, when the contents of the input month data are for a month other than February, a gate signal is supplied from the inverter 26 to the AND gates 21 and 22.

Here, as shown in Table 2 and Figure 4, the input month data is a 2-digit decimal number in which the 1st place is represented by M○ and the 10th place is represented by MI, and each is encoded as a 4-bit binary number. has been done. Table 2 Therefore, in February, bits t4, et al, t of the binary number of the first MO
Since 2 and t are respectively 0, 0, 1 and 0, if inputs t4, t3, t2 and t are given to the AND gate 23, the AND gate 23 can easily determine whether it is February or not.

By the way, from Table 2, t, bit of MI is “
1”, or since the t4 bit of MO is “1”,
The t, bit of MI is applied to the AND gate 21 in FIG.
It is only necessary to combine the output of the MO and the MO bit with the OR gate 30 to detect August or more as the output of the OR gate 30. Therefore, if the output of the OR gate 30 is inverted by the inverter 31, the inverter 31 will output "1" only at the end of August. OR gate 3
The output of the inverter 31 is supplied to one input terminal of the AND gates 32 and 33, and the output of the inverter 31 is supplied to the AND gates 34 and 3.
5 is supplied to one input end of 5. On the other hand, as is clear from Table 2, odd-numbered months ending at the end of August and even-numbered months beyond August are large months, and the bit after MO is "1".

Therefore, if the t, bit of the number of days data MO is supplied to the AND gate 22, when the output of the AND gate 22 is "1", the input month data is an odd month ending at the end of August and an even month starting from August. I understand. Therefore, AND gate 22
If the output is supplied to the other input terminals of the AND gates 33 and 34, an output will be output from the AND gate 34 when the end of August is over, and an output from the AND gate 33 when it is over August. Similarly, the output of the AND gate 22 is passed through the inverter 36 to A
If supplied to the other input device of ND gates 32 and 35, 8
An output is obtained from the AND gate 35 when it is less than a month, and from the AND gate 32 when it is more than eight months. Therefore, A.N.
If the outputs of the D gates 32 and 34 are taken out through the OR gate 37, and the AND gate 38 obtains the logical product of the output of the OR gate 37 and the content of day counter 8 on the 31st, then
Output for changing the month and number of days in the case of a large month is obtained from the gate 28. Similarly, AND gates 33, 35
The output of the OR gate 39 is taken out through the OR gate 39, and the AND gate 40 combines the output of the OR gate 39 and the 30 of the day counter 8.
By obtaining a logical product with the contents of the day, an output for changing the month and number of days when the month is small can be obtained from the OR gate 28. Although the above embodiment has been explained by showing an example of a clock device using a normal counting counter, the present invention is not limited to this, and the present invention is not limited to this. is stored in a register, the reference signal from the oscillator is frequency-divided, and this frequency-divided output is added to the contents of the register using an arithmetic unit, and the control is performed using microinstructions (ROM Of course, the present invention can also be applied to an electronic timepiece device that performs control.

As described above, according to the present invention, it is possible to distinguish large months and small months by distinguishing whether February and months other than February are odd-numbered or even-numbered months with August as a reference. As a result, the equipment can be made smaller or the cost can be reduced.

In particular, by using microinstructions to determine large months, small months, etc. through ROM control, it is possible to determine to which month the month belongs and whether it is a large month or a small month. It can be determined in a short time with a small number of steps without any discrimination, and there is no need to memorize in advance whether January to December is a large month or a small month, etc., simplifying the circuit. You can also do it.

[Brief explanation of drawings]

FIG. 1 is a block configuration diagram of a timekeeping device incorporating a month/day discrimination circuit according to the present invention, FIG. 2 is a flowchart for explaining the operation of the present invention, and FIG. 3 is a block diagram of a time counting device incorporating a month/day determination circuit according to the present invention. FIG. 4 is a block circuit diagram showing the circuit, and is a diagram showing the structure of a register storing clock information. 1... Oscillator, 2... Frequency divider circuit, 3.
...Time counting circuit, 4...Decoder, 5...Display section, 6...AM/PM discrimination circuit, 8...
・Days counter evening, 10...Months counter, 11
...4 Leap year discrimination circuit, 12... Month and day discrimination circuit. Figure 1 Figure 2 Figure 3 Figure 4

Claims (1)

[Claims] 1. At least a day counting means for counting days and a month counting means for counting months, and based on the contents of the days counting means and the contents of the months counting means, the days counting means In an electronic watch equipped with a month and date automatic discrimination function that supplies a signal that increases the month number counting means by 1 and a signal that sets the content of the day number counting means to "1" when the number of days is counted, the automatic month and day discrimination function is provided. means for determining whether the content of the month number counting means is February or not; and means for determining whether the content of the month number counting means is less than August or more than August when the content of the month number counting means is not February; A means for determining whether the month is an odd month when the content of the month counting means is less than August, and a means for determining whether the month is an odd month when the content of the month counting means is more than August. and a control means for controlling the judgment operation in each of the means by microinstructions, and if the number of months less than August is an odd number except February, the month is a month with 31 days, and the month is an even number. Then, it is determined that it is a small month of 30 days, if the number of months of August or more is an even number, it is determined that it is a major month of 31 days, and if it is an odd number, it is determined that it is a small month of 30 days. Month and day determination method for watches.