JPH03211491A - Electronic timepiece - Google Patents

Abstract

PURPOSE:To obtain the inexpensive electronic timepiece with high accuracy by calculating the time deviation of the electronic timepiece and thinning out or adding counting operation for reference oscillation pulses so that the time deviation becomes zero in a specific time interval. CONSTITUTION:For example, a display time 13:00:05 on a display device 102 is corrected into 13:00:00. A 1st storage means 104 is stored with 13:00:05; and 13:00:00 is stored in an area R1 of a 2nd storage means 106 and 12:00:00 is stored in a 2nd area R2. An observation period is therefore one hour and a time quantity which needs to be corrected is -5 seconds. Namely, the current time in the observation period is 5 seconds fast, so a frequency error is calculated from 5/3,600. For the purpose, a pulse control means 110 corrects the time deviation by thinning out the reference oscillation pulses so that the frequency error becomes equivalently 0.

Description

DETAILED DESCRIPTION OF THE INVENTION A. Field of Industrial Application The present invention relates to an electronic timepiece that displays the current time by counting reference oscillation pulses.

B. Prior art This type of electronic watch is configured to include a reference oscillation circuit such as a crystal oscillation circuit, and display the current time by counting reference oscillation pulses generated from this reference oscillation circuit. is common.

However, when the frequency of the reference oscillation pulse changes due to external factors such as temperature changes, this causes the time to lag or advance, reducing the accuracy of the clock.

Therefore, as seen in Japanese Unexamined Patent Publication No. 58-223088, a temperature detection sensor was provided, and temperature information was used as a variable.
An electronic timepiece has been proposed in which the frequency error of the reference oscillation pulse is corrected using the following function.

C9 Problems to be Solved by the Invention However, since the above-described conventional device requires a temperature detection sensor, there is a problem in that the number of components increases and the device becomes complicated, leading to high costs.

An object of the present invention is to obtain a highly accurate electronic timepiece with a simple and inexpensive configuration.

03 Means for Solving the Problems The present invention will be explained based on FIG. A correction switch 103 that is operated in accordance with a highly accurate predetermined time such as a time signal, and when the correction switch 103 is operated, the time on the display 102 is set as the current time before correction. a first storage means 104 for storing; a current time correction means 105 for updating the current time on the display 102 to a predetermined time when the correction switch 103 is operated; While storing it in area R1,
At this time, the second storage means 106 stores the time already stored in the first area R1 as the previously revised time in the second area R2, and the corrected time stored in the first area R1. A correction time amount measuring means 107 that calculates the amount of time required for correction from the difference from the current time before correction stored in the first storage means 104;
Observation period calculation means 108 calculates the observation period for correction from the difference between the corrected time stored in the area R1 and the previous correction time stored in the second area R2, and calculates the amount of time required for correction. Frequency error calculation means 109 for calculating the frequency error of the reference oscillation pulse per hour by dividing by the observation period
The above object is achieved by comprising a pulse number control stage 110 that prohibits or adds the input of the reference oscillation pulse to the counter that counts the reference oscillation pulse so that the 1 frequency error becomes uniformly zero. be done.

E3 action For example, set the previous corrected time to 12:00 OO minutes OO seconds, operate the correction switch 103 in accordance with the current 13:00 time signal, and change the displayed time on the display 102 from 13:00:05 to 13:00.
It is assumed that the time is corrected to 0 minutes OO seconds. First storage means 10
4 stores 13:00:05 seconds, the first area R1 of the second storage means 106 stores 13:00 minutes 00 seconds, and the second area R2 stores 12:00 minutes OO seconds. be remembered. Therefore, the 1 wL measurement period is 1 hour, and the amount of time required for correction is 15 seconds. That is, since the current time in the observation period advances by 5 seconds, the frequency error calculation means 109 calculates the frequency error per hour (for example, per second) by 5/36.
Calculate with 00. Therefore, the pulse number control means 110
The reference oscillation pulses sent to the counter that counts the reference oscillation pulses are thinned out so that this frequency error becomes equal to zero.This corrects the deviation in the current time caused by the frequency error of the reference oscillation pulses using only arithmetic processing. can do. To correct the delay in the same way, it is sufficient to add a reference oscillation pulse.

F. Embodiment FIG. 2 is an overall block diagram showing an embodiment of the present invention, which includes a basic oscillation circuit 2 that generates a reference clock pulse using an oscillator 1, and a basic oscillation circuit 2 that generates a reference clock pulse using an oscillator 1, and a current time by counting this reference clock pulse. A basic clock circuit 4 that displays on a display 3, a correction switch 5 that is operated in accordance with the 1 hour signal, a reset switch 6 that switches to a mode that does not correct the current time deviation, and a microprocessor (C: PU)7.

Here, the CPU 7 has a built-in register or memory that stores the current time, the current time when the correction switch 5 was operated, the time of the previous correction switch operation, and the like.

Next, the operation of the electronic timepiece having the above configuration will be explained based on the flowchart shown in FIG.

First, when the reset switch 6 is operated.

The CPU 7 sets the correction signal output to the clock circuit 4 to a state in which correction is not required (steps SL, S2), when the time is set manually here.

The manual setting time is set as the time when the correction switch 5 was operated last time (previous correction time) (step S3.S
4).

Next, when the clock circuit 4 counts one reference clock pulse (step S6), the correction switch 5 is operated and the
Check whether an interrupt is applied to PU1 (step S7)
, if there is no interrupt, check whether the correction signal is at a level that requires correction (step 520);
If the level does not require correction, the process returns to step S5 and waits for the next reference clock pulse to be generated. This loop continues until the correction switch 5 is operated.

When the correction switch 5 is operated and an interrupt is generated, the process advances from step S7 to step S9, and the current time on the display 3 is updated to the corrected time when the correction switch 5 was operated (step 59) 1. For example, according to the 12 o'clock time signal. When the correction switch 5 is operated and the contents of the register indicating the current time inside the electronic clock are 11:59:55, the current time register is updated to 12:00:00 seconds. In addition, by calculating the difference between the current time before correction and the current time after correction (5 seconds in the above case), the amount of correction time required for correction is calculated (step 510). 12 if
hour OO minute 00 seconds) and the previous correction time (13 in the above case)
hours OO minutes OO seconds) to calculate the time during which the time shift was observed, that is, how many hours the correction amount was observed (step 5ll).

In this embodiment, the previous correction time is defined as the time when the time was manually set, but if the current time updated in step S9 is also stored as the previous correction time, the steps from step S7 to step 820 to While going through the loop from S26 to Steps 85 to S7, press the correction switch 5.
is operated again, the correct [1
9 periods can be calculated.

These steps S10. It can be seen that there was a time lag of t seconds during X time (ci sub-time) due to Sll.

Therefore, it is checked whether the observation time was a predetermined time, for example, 1 hour -E (step 512), and if it is affirmative, the process moves to the time adjustment operation from step S13 onwards.

If negative, the process returns to step S5.

In step S13, the number of times of correction for correcting the time difference in seconds is determined. The number of corrections is obtained by dividing the 1wi measurement period by the value of the previous correction interval.

The previous correction interval indicates a value calculated in step S14 last time as a time interval representing a cycle in which correction (thinning or addition) is performed for one count of the reference clock pulse.

Next, in the same step S13, the correction amount is set to "
It is calculated by calculating the amount of correction time + number of corrections x correction time per correction x (-correction sign). That is,
The term "number of corrections x correction time per correction x (=correction sign)" is the time that has already been corrected up to now, so by adding the newly measured amount of correction time to this, it is possible to The correction time amount to be corrected is stored as a correction correction amount. This amount of correction is an accumulated amount of correction.

Therefore, in the fifth step S14, based on this correction amount, the correction interval that determines the time interval at which the correction for one force count of the reference clock pulse is performed is determined. Obtained by calculating the amount/observation period. Here, the correction amount/l
Ill shows the frequency error of the open period quasi-clock pulse.

After this, the reference clock pulses may be thinned out or added at the time interval calculated in step 514 until the number of corrections becomes zero.

Therefore, after clearing the correction number counter in the first step S15, it is determined whether the correction amount is positive or negative (step 516). If it is positive, the correction direction is set to the delay side, and if it is negative, it is set to the advance side. (step S17.818), and when the correction amount is O, step S16 to step S5
Then, by adding the correction interval to the current time, the correction execution time at which the correction is actually executed is calculated (step 819), and the process returns to step S5 to generate a new reference glock pulse. stand by.

When a new reference clock pulse is generated, the current time is updated by one count, and the process then proceeds to step S7.If there is no interruption due to the operation of the correction switch 5, the process proceeds to step S20, where the reset switch 6 is turned on. If it is determined that there is no correction execution time, the process advances to step S21 to check whether the current time≧correction execution time. If it is affirmative, that is, at the scheduled correction execution time, the correction direction is checked (step 522), and if the correction direction is set to the advance side, the reference clock pulse is set to be added by one count (step 824). On the contrary, when the correction direction is set to the delay side, the reference clock pulse should be set to be ignored by one count (step 823), and this is instructed to the clock circuit 4 by a lead/lag signal.

As a result, when a new reference clock pulse is generated, the clock circuit 4 thins out or adds one clock pulse to the new reference clock pulse.

After this, the correction number counter is incremented by one, and the next correction execution time is calculated in step S26, and the process returns to step S5.

In this way, when a frequency error appears in the reference clock pulse, the frequency error can be equivalently eliminated by simple arithmetic processing by thinning out or adding to the count operation of the clock circuit 4 according to the frequency error. can.

G0 Effects of the Invention As described above, according to the present invention, 1. For example, the time deviation of an electronic watch within the time interval of two time adjustment operations before and after is calculated, and this time deviation becomes zero within a predetermined time interval. By thinning out or adding the counting operation of the reference oscillation pulses, the frequency error of the reference oscillation pulses is equivalently reduced to zero, so that the time difference can be eliminated by simple arithmetic processing. As a result, an inexpensive and highly accurate electronic timepiece can be provided without complicating the configuration.

[Brief explanation of drawings]

FIG. 1 is a complaint correspondence diagram. FIG. 2 is an overall block diagram showing one embodiment of the present invention, and FIG.
The figure is a flowchart showing the time adjustment procedure. Oscillator 2: Basic oscillation circuit 01 03 05 07 09 4: Basic clock circuit 7: Microprocessor 102: Display 104: First storage means 106: Second storage means 108: Observation period calculation means 110: Number of pulses Control means: Display: Correction switch: Counter: Correction switch: Current correction means: Correction time measurement means: Frequency error calculation means

Claims (1)

[Claims] In an electronic timepiece that has a counter that counts reference oscillation pulses and a display that displays the time based on the count value of this counter, a correction that is performed in accordance with a highly accurate predetermined time such as a time signal. a switch; first storage means for storing the time on the display as the current time before correction when the correction switch is operated; and updating the current time on the display to the predetermined time when the correction switch is operated. and a current correction means for storing the time corrected by the current correction means in a first area, and storing the time already stored in the first area at this time in a second area as the previous correction time. Second
storage means; and correction time amount measurement for determining the amount of time required for correction from the difference between the corrected time stored in the first area and the pre-correction current time stored in the first storage means. means, observation period calculation for obtaining a corrected observation period from the difference between the corrected time stored in the first area of the second storage means and the previous corrected time stored in the second area; means for calculating a frequency error of the reference oscillation pulse per hour by dividing the amount of time requiring correction by the observation period; An electronic timepiece comprising pulse number control means for prohibiting or adding a reference oscillation pulse to a counter that counts oscillation pulses.