JPS62148883A - Electronic timepiece with function to discriminate leap year - Google Patents

Abstract

PURPOSE:To permit the quick discrimination of leap years with a simple circuit and processing program by doubling the count value of the yearly 10th place digit of a basic clock, adding the result thereof and the count value of the yearly 1st place digit and discriminating whether the remainder obtd. by dividing the result by 4 is zero or not. CONSTITUTION:The 4-bit BCD code of a yearly 10th place digit counter 34 is outputted to a shift register 41 for multiplication where the code is doubled by once shifting the same to the left. The output of the lower 2 bits of the count value of a yearly 1st place digit counter 33 and the lower 2 bits of the result of the leftward shift of the register 41 are outputted to a remainder detecting circuit 51. The processing to add the 2 bits is executed in the circuit 51. The exclusive OR is obtd. from the 2-bit code in a leap year discriminating circuit 61. A signal 161 of a high level is outputted to a month end correcting means 70 when the 2-bit code is '00'.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to an improvement of leap year determination processing means in an electronic timepiece.

[Conventional technology]

Like a clock, it counts on the reference signal, and this is 2 hours, 2 minutes, seconds, 1 year, 9.
If you want to output counting results for each digit according to the second day of the month, you need to calculate whether each year is a normal year or a leap year and then process the end of February. The 29th day of the month will be considered as the full effective date, and the date will be moved to March 1st the following day. Conversely, in normal years, the effective date is until February 28th, and must be moved to the next day, June 1st. The methods for determining whether it is a leap year or a normal year include: 1) The 7J method, which divides the Western calendar year number by the number 4 and determines whether it is a leap year or not based on whether or not it is divisible.

2) The tenth digit of the year is an even number including Ot, and the first digit of the year is 0.4.
8, or the tenth digit of the year is an odd number and the first digit of the year is 2.6
How to judge it as a leap year when
According to 1. The circuit configuration diagram when this is realized in a circuit is shown in Figure 7, and the flowchart at 9 o'clock t-8 shows the software processing of it.
As shown in the figure] 3) In addition to the year-digit counter for timekeeping, there were seven quaternary counters for determining leap years, and there was a method to determine that it was a leap year when the counted value was zero.

[Problem that the invention seeks to solve]

However, the method shown in prior art (1) requires a four-digit division circuit or a division program, which leads to an increase in circuit scale or processing program1, and further increases processing time and current consumption. It has the problem of inviting people.

Furthermore, in the method shown in prior art (2), the software and hardware loads are reduced compared to the method (1). However, as a process, it is first determined whether the tenth digit of the year is an even number or an odd number, and then, if the tenth digit of the year is an even number, the first digit of the year is 0, 4, or 8.
, if the tenth digit of the year is an odd number, indicate whether the first digit of the year is 2 or 6.
1 must be determined, and the processing (see Figures 7 and 8) is 1! I'll ``llf'' the problem that it becomes cluttered.

Furthermore, in the method (3) of the prior art, a westward counter is required in addition to the clock counter in terms of hardware or software, resulting in an increase in circuit standards and software. Furthermore, if such a counter method is adopted, the counter value of this westward counter must also be corrected whenever the basic clock is corrected, which is M.

On the other hand, the present invention solves these problems in the conventional technology, reduces the size of circuits and software to the necessary minimum, and simplifies the processing itself, reducing current consumption and
The purpose is to reduce processing time and provide a highly versatile wristwatch with a leap year determination function suitable for small portable devices.

[The tth way to solve the problem]

The leap year determination function of the present invention is based on an electronic timepiece that counts a reference signal and displays the value using a display device such as a liquid crystal display.

a) Means for counting the year digits independently of the first digit and the tenth digit of the year b) Multiplication means for the tenth digit of the year by doubling the count value of the tenth digit of the year C) Tens digit t of the year - Remainder detection means for calculating the remainder of 4 by adding 2 times 90 and the count value of the first digit of the year by 7d) Determining whether or not it is a leap year by checking whether or not the remainder detection result is zero It is characterized by having a full range of leap year determination means.

[Effect]

In order to carry out the above structure, the present invention looks at the tenth digit of the year and the first digit of the year of the basic clock, which are counted independently, and calculates the counted value of the tenth digit of the year? , multiply by 2 using year tenth digit subtraction means, calculate the result by 70,000 units of the count value of year first digit 0, and detect the remainder by dividing the addition result by 4 by using remainder detection means, By using a leap year determining means to determine whether or not it is zero, it becomes possible to easily determine whether or not it is a leap year.

〔Example〕

Hereinafter, the present invention will be described in detail based on embodiments. Fig. 1 is a block diagram of an example of an electronic timepiece with a leap year determination function according to the present invention.

10 is an oscillation circuit that oscillates a basic signal using a crystal resonator, a ceramic resonator, or the like. 20 is the oscillation circuit 10
This is a frequency dividing circuit that divides the frequency of a reference signal 100 from a 1 Hz signal and generates a signal 101 of 1 Hz or the like.

50 is hour 1 minute 1 second counting means for counting the signal 101 in the order of seconds → minutes → hours; 31.32 is hour 1 minute 2 second counting means 50
These are day digit counting means and month digit counting means for sequentially counting carry signals 102 from . 53゜34, 35, 36 are year one digit counting means, year tenth digit counting means, year hundredth digit counting means, and year tenth digit counting means, respectively, which sequentially count the carry signals of the month digit counting means 32. It is.

050, which is a year tenth digit surplus calculation means that doubles the # value of the year tenth digit counting means 53, is a cutting tool that doubles the # value of the year tenth digit counting means 53. This is a remainder detection means for finding the remainder of the fourth. Reference numeral 60 denotes a leap year determination means for determining whether or not the current year is a leap year by checking whether or not the remainder detection result is zero. Leap year correction judgment is required based on each count value.

[More details below]. Reference numeral 70 denotes month-end correction means that receives the signal of the judgment result 108 from the leap year judgment means and performs the end-of-month correction processing for February.

Reference numeral 82 is an external switch, and the ratio signal taken in from the switch is discriminated and processed by the switch control means 81. Among the discriminated friend switch signals, the basic clock correction signal 110 is output to the basic clock correction control means 80, selects a correction digit from the basic clock counting means (0 to 66), and corrects that digit. If the year digits have been corrected,
Similarly to the above, it is determined whether or not the year corrected by the year tenth digit 5141 calculating means 40, remainder detecting means 50, and leap year determining means 60 is a leap year.

In addition, the above-mentioned 30 to 36, 40, 50, 60°70.80
, 81.90 can be implemented as a circuit, or can be implemented in software as a program.

Next, the basic thinking behind leap year determination processing, which is the key point of the present invention, will be explained.

- In S, a leap year occurs once every four years, that is, a year that is divisible by dividing the year digit by 4 is considered a leap year.0However, if the year is divisible by 100, it is considered a normal year, and If it is divisible by 400, it is considered a leap year.

If we consider the period from 1000 to 2099, any year (Y) can be calculated as a * b * Cr d if the count value of each digit from the 10th digit to the 1st digit of the year is a * b * Cr d , Y=a
It is expressed as X1000+bX100+cX10+d.

The remainder obtained by dividing this by 4 is (hereinafter referred to as mod
a) Y(moda)=aX1 oo O(moda)+
bX100(moda)+cXiO(moda)+
What is d (moda)? L is 1 (100, 100, Tweet U4O remainder is 0, and it is further expressed as 10 = 2 * 4 + 2, so finally Y (moda) = c: B (modd) + a (moda)
-((c*z)+a)(LIIoaa).

That is, in order to determine whether a given year is a leap year, it is sufficient to double the tenth digit of the year, calculate the ratio value, and find the remainder of 4, which is the sum of the first digit of the year. Of course, you can also double the tenth digit of the year to find the remainder of 4 in the ratio value and add it to the remainder of 4 in the first digit of the year, or you can also find the remainder of 4 in the tenth digit of the year. ,
You can also double it and add the remainder of 4 in the first digit of the year.

Next, the main points of the present invention will be explained based on actual examples of hardware and software. Fig. 2 is a logic circuit diagram of an example in which the present invention is implemented using a circuit. It is. In the figure, 63.34 is a 4-bit output counter in binary to decimal notation (hereinafter referred to as BCD code) using Frisobuflotz 1, etc., which is incremented by a year one digit counter and a year ten digit counter. 5.56 is a year hundreds digit counter and a year tenth digit counter. This 5il! In the example shown in FIG. 2, the years 1901 to 2099 are treated as target years, so the 100-year digit and above are not subject to leap year determination processing.

The 4-bit BCD code of the year tens digit counter 34 is output to the remainder shift register 41 (year tens digit remainder calculation means). Here, by shifting to the left once, the value in the register is shifted to the left one bit at a time, the least significant bit is set to 0, and the count value of the tenth digit of the year is doubled. Then, the output of the lower two bits of the count value of the year one-digit counter 53 and the lower two bits of the left shift result of the remainder shift register 41 are output to the remainder detection circuit 51.

The reason why only the lower two bits are output to the remainder detection circuit 51 is that in the BCD code, the remainder of 4 is obtained by ignoring the upper two bits (hereinafter referred to as masking). 〇(For example, 9 (decimal) = [1001
The remainder of 4 in J(BCD) is 1, which is ij: B
Mask the upper 2 bits of the CD code to 5r00”Jt
0, which is equal to what we want] In this way, the remainder of 4 of the value obtained by doubling the tenth digit of the year and the remainder of 4 of the first digit of the year are subjected to 2-pinto addition processing in the remainder detection circuit 51. By this 2-focus addition process,
Double the first digit of the year and the tenth digit of the year and find the remainder of 4 of 1m using a 2-pinto code.

Furthermore, this 2-pin code is subjected to an exclusive OR in the 61 leap year judgment circuit, and when the 2-bit code is "OO",
A high level signal 161 is output to the month-end first means 70.

FIG. 4 shows a flowchart when this is realized in software. However, due to software processing,
At 400, shift the value of the year tenth digit counter once to the left and set it to 2.
After the multiplication, at 401, the value of the one-digit year counter and the value of the tenth-digit counter of the year are multiplied by 4 points, and then at 402, the addition result is shifted to the left twice, The remainder of 4 is calculated by shifting the contents of the 4-pit register or memory to the left by 1 pin, and 0 is sequentially placed in the lowest pin. This shift result is the addition result of 4
Since it is multiplied and the top two points are masked, you can determine whether it is a leap year or not depending on whether or not there is a zero, but the correct 4
It does not mean that we are looking for the remainder of . (To find the correct remainder of 4, as shown in Figure 5, multiply the middle digit of the year by 't-2, mask the top 2 pintos, and find the remainder of 4.) (There is also a method of adding the masked values and then masking the top two focuses.) Next, the embodiment shown in FIG. 3 will be described.

This embodiment includes leap year correction for digits of 100 years or more, and enables leap year determination over a longer period of time than in the previous example.

First, 55 to 66 are counters based on the binary coded decimal system, and output 4-pin B and D codes. 52 is a remainder detection circuit, and instead of multiplying the tenth digit of the year by two, it calculates the lowest focus (0 focus) of the tenth digit of the year, and exclusively doubles the first focus of the first digit of the year. Exclusively OR the logical nt and the 0 bit of the first digit of the year, and the result is (remainder of 4 of the value obtained by doubling the tenth digit of the year) and (the first digit of the year). (remainder of 4) is added, the remainder is further determined, and a signal 152 is output for determining whether or not it is zero. on the other hand,
The leap year judgment circuit 62 determines whether the first digit of the year and the tenth digit of the year are both zero and the remainder of 4 of the sum of the value obtained by doubling the tenth digit of the year and the hundredth digit of the year is zero, that is, 100. Check whether the year is divisible by 400 years and whether the year is divisible by 100 years and the remainder of 4 is zero, or 100 years. A year that is divisible by and evenly divisible by 400 years is determined to be a leap year, and a leap year determination signal 162 is output.

The month-end correction means 70 processes the end of February in accordance with the signal level of the leap year determination signal 162.

Further, FIG. 6 is a 70-chart of a processing program for leap year determination including correction for 100-year digits or more. first digit of the year,
The processing branches depending on whether or not the tenth digit of the year is 00, but it is 602
~604 and 602'~6041 are the same as the processing program 1, so they can be made into subroutines.

In addition, the processing contents in steps 602 to 606 are the same as in the flowchart shown in FIG. Addition (605), this is shifted to double pressure, the upper two bits are masked, and it is determined whether the remainder of 4 in the addition result is zero or not, and the leap year judgment club is set. Of course, the processes 602 to 606 may be replaced with the processes shown in FIG. 5 of the whistle.

Further, in this example, the year counter is a 4-pin counter corresponding to the BOD code, but the present invention is not limited to this.

Furthermore, the remainder detection, leap year determination circuit, and each program processing are merely examples, and are not particularly limited thereto.

〔Effect of the invention〕

As described above, according to the present invention, when determining a leap year in an electronic watch with a leap year determination function, the first digit of the year and the tenth digit of the year are counted independently, and the counted value of the tenth digit of the year is calculated as 2. The system is configured so that it is multiplied, the sum of the first digit of the year is calculated, and the remainder of 4 is determined, and whether or not it is a leap year is determined based on whether or not the remainder is zero. This has the advantage that it can be realized in a short time using a simple circuit and processing program.

In particular, when the circuit is configured, the BCD code output of a 4-pin counter, which is commonly used as a year digit counter, can be used as is, so the only new additional circuit required is an adder circuit for the lower 2 pins. . Therefore, the circuit load on the entire system of the conventional electronic timepiece is extremely small, and has great effects in terms of cost and current consumption. Furthermore, when performing leap year judgment processing over a long period of time, including the year hundredth digit and year tenth digit in Application 1~, according to the present invention, the processing for the year tenth place and - year digit is the same. It is sufficient to apply the above processing to the thousands and hundreds digits of the year, and only requires adding a discriminating gate circuit to check whether both the first and tenth digits of the year are zero.

Therefore, it has the effect that it can be applied to an electronic timepiece with a leap year determination function over a long period of time with almost no load on the circuit or current consumption.

Of course, from a software perspective, it is the conventional one (see Figure 8).
Since there is less branch processing compared to the previous version, it has a great effect on shortening program processing time and reducing current consumption. In addition, the processing itself is centered on simple addition in 4-focus units and 4-focus shift processing, so any low focus CP
This has the advantage that it can be easily realized even by using u. Furthermore, as an application of this, when performing leap year judgment processing over a long period of time, including processing of the hundreds and tenth digits of the year, the remainder detection will be performed using the year -
Since the processing operations are the same as those for the digits and tens digits, it is possible to create a subroutine and reduce the number of programs.

Of course, according to the present invention, leap year determination depends on the current count value of the basic clock, so it does not matter whether the basic clock is corrected by an external signal or the target year is in the future or the past. It has extremely high versatility in that the leap year determination process is inverted regardless of the date.

Therefore, according to the present invention, in any electronic watch that aims to have low current consumption and small size and portability, it can be used with almost no load in terms of cost, circuit or program size.
It becomes possible to add a leap year determination function.

[Brief explanation of drawings]

FIG. 1 is a block diagram of an electronic timepiece with a leap year determination function of the present invention, and FIG. 2 is a logic circuit diagram of a leap year determination processing circuit of the present invention.
FIG. 3 is a logic circuit diagram of a leap year determination processing circuit including the hundreds and tens digits of the year to which the present invention is applied. 4 and 5 are flowcharts of the leap year determination processing program of the present invention. FIG. 6 is a flowchart of a leap year determination processing program including year hundreds and tens digits to which the present invention is applied. FIG. 7 is a logic circuit diagram for leap year determination according to a conventional example. FIG. 8 is a flowchart of a conventional leap year determination processing program. In the figure, 10... Oscillation circuit 20... Frequency dividing circuit 60... Hour minute/second counting means 51... Day digit counting means 52... Month digit counting means 35... Year one digit counting means 54... Year tens digit counting means 65... Year hundreds digit counting means 56... Year tens digit counting means 40... Year ten digit multiplication means 41... Shift register for multiplication 50...・Remainder detection means star 60...
・Leap year determination means 51.52... Surplus detection port 70
. . . Month end correction means 80 . . . Basic clock correction control means 81 . . . Switch control means 61. 62 .
...Display output control device 0...Input terminal 91...Display device 900.901...Output terminal or higher Applicant: Seiko Epson Co., Ltd. Agent, Patent Attorney Mogami,... )−1,゛～°゛; Figure 4

Claims (1)

[Scope of Claims] An electronic timepiece that counts reference signals and displays the value using a display device such as a liquid crystal, which: a) counts independently the first digit of the year and the tenth digit of the year of the basic clock; Year digit counting means b) Year 10th digit multiplication means that doubles the count value of the year 10th digit c) Adds the value obtained by doubling the year 10th digit and the count value of the year 1st digit; d) Remainder detection means for determining the remainder of d) An electronic timepiece with a leap year determination function, comprising a leap year determination means for determining whether or not it is a leap year based on whether or not the remainder detection result is zero.