JPH0664165B2 - Clock counting device - Google Patents

Description

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention mainly relates to a clock or a counter that counts a power supply frequency as a basic clock, and relates to a device for performing timer control in each field.

2. Description of the Related Art In recent years, clock counting devices have come to have a control system in which products of various fields have a built-in clock and a timer and automatically operate or stop when a certain set time is reached. Therefore, the number of devices that use a power supply frequency that is inexpensive and has a small error as a basic clock is increasing. However, various kinds of noise may be applied to the power source, and therefore, there is a need for a timepiece counting device that minimizes an error even if noise is applied.

An example of the above-described conventional timepiece counting device will be described below with reference to the drawings.

FIG. 3 is a block diagram of a conventional timepiece counting device. In FIG. 3, reference numeral 1 is an outlet for inputting commercial power. Reference numeral 2 is a power supply frequency detection unit that detects the frequency of the commercial power supply from the outlet 1 and generates a basic clock. A constant voltage unit 3 rectifies, steps down and stabilizes the commercial power source from the outlet 1. An external counter 4 receives the basic clock from the power supply frequency detector 2 and counts it. Reference numeral 5 denotes a timer unit, which divides the content of the external counter 4 and acts as a clock. A microcomputer 6 is composed of the external counter 4 and the timer unit 5. Reference numeral 7 denotes a microcomputer driving oscillator, which supplies a driving clock to the microcomputer 6.

The operation of the timepiece counting device configured as described above will be described below.

First, based on the commercial power input from the outlet 1, the frequency of the commercial power is detected by the power frequency detector 2 and a basic clock corresponding to the frequency is generated. Further, the constant voltage unit 3 rectifies, steps down and stabilizes the commercial power source and supplies it to the microcomputer 6. The microcomputer 6 comprises an external counter 4 and a timer unit 5, the external counter 4 counts the basic clock from the power supply frequency detection unit 2, and the timer unit 5 further divides the contents of the external counter 4 to act as a clock. . The operation of the microcomputer 6 is sequentially performed by the driving clock from the microcomputer driving oscillator 7.

DISCLOSURE OF THE INVENTION Problems to be Solved by the Invention However, in the above configuration, noise is applied to the commercial power supply, and when the noise is detected by the power supply frequency detection unit 2, the cycle of the basic clock is distorted, The external counter 4 counts this basic clock,
Further, since the timer unit 5 divides the contents of the external counter 4 to work as a clock, there is a problem that the clock may be out of order and that the out of order cannot be predicted due to the degree of noise application. .

In view of the above problems, the present invention minimizes the influence of noise when a commercial power source is applied with noise, and predicts the maximum value of the clock shift even if the noise of the commercial power source is maximized. It is possible to provide a counting device for a timepiece.

Means for Solving the Problems In order to solve the above problems, a timepiece counting device of the present invention detects an outlet for inputting a commercial power source and a frequency of the commercial power source from the outlet to generate a basic clock. A power supply frequency detection unit, a constant voltage unit that rectifies, steps down, and stabilizes commercial power from the outlet, and an external counter, a determination unit, and an internal counter that operate based on the stabilized power supply from the constant voltage unit. A microcomputer having a time-up counter timer and a microcomputer driving oscillator for supplying a driving clock to the microcomputer, and for driving the microcomputer when the basic clock from the power supply frequency detection unit is input. Counted the number of times the internal counter timed up by dividing the basic clock from the oscillator Compare with the contents of the time-up counter If the contents of the time-up counter are less than the normal value, do not count, and only when the time-up counter exceeds the normal value, the external counter counts up and the time-up It is provided with a judging unit for outputting a signal for clearing the contents of the counter, and a timer unit for dividing the contents of the external counter and acting as a clock.

Effect According to the present invention, even if noise is applied to the commercial power supply and the cycle of the basic clock from the power supply frequency detection unit is deviated by the above-described configuration, the determination unit determines whether the basic clock is correct or incorrect. Is less. Even if a lot of noise is applied to the commercial power supply and the cycle of the basic clock becomes random, the maximum value of clock deviation is within the variation tolerance of the microcomputer drive oscillator because the internal counter contents are counted by the external counter. It means that it is possible to

Example Hereinafter, regarding the timepiece counting device of one example of the present invention,
A description will be given with reference to the drawings.

FIG. 1 is a block diagram of a timepiece counting device according to an embodiment of the present invention. In FIG. 1, reference numeral 8 is an outlet for inputting commercial power. Reference numeral 9 is a power supply frequency detection unit, which detects the frequency of the commercial power supply from the outlet 8 and generates a basic clock. Reference numeral 10 denotes a constant voltage unit, which rectifies, steps down and stabilizes the commercial power source from the outlet 8. 11 is a microcomputer. 12 is an internal counter, 13 is an external counter, 14 is a determination unit, 16
Is a time-up counter, and 17 is a timer unit. The microcomputer 11 has an internal counter 12 and an external counter 1.
3, determination unit 14, time-up counter 16, time unit 17
It is composed by. Reference numeral 15 denotes a microcomputer driving oscillator, which supplies a driving clock to the microcomputer 11 and also serves as a basic clock for the internal timer 12. The value at which the internal timer 12 times up is set to be smaller than the cycle of the basic clock from the power frequency detector 9.

The internal counter 12 is an oscillator 15 for driving a microcomputer.
The clock is divided and output to the time-up counter 16 every time the time is up. The determination unit 14 compares each of the signals from the power supply frequency detection unit 9 with the content of the time-up counter 16 to determine whether the signal is correct, and if correct, counts the external counter 13 and clears the time-up counter 16. Also, the judgment unit
Even when the value of the time-up counter 16 exceeds the normal value, the external counter 13 counts the above contents and clears the time-up counter 16 even when the basic clock from the power supply frequency detection unit 9 is not input. The timer unit 17 divides the content of the external counter 13 and acts as a clock.

The operation of the timepiece counting device configured as described above will be described below with reference to FIGS. 1 and 2.

First, FIG. 2 shows conditions for counting an external count of the counting device of the timepiece according to the present invention.

The frequency of the commercial power source is detected by the power frequency detector 9 based on the commercial power source input from the outlet 8 and a basic clock corresponding to the frequency is generated. Further, the constant voltage unit 10 rectifies, steps down and stabilizes the commercial power source to supply power to the microcomputer 11. Microcomputer
The reference numeral 11 includes an internal counter 12, an external counter 13, a determination unit 14, a time-up counter 16 and a timer unit 17. The internal counter 12 divides the oscillation of the microcomputer driving oscillator 15 to form a timer,
Each time it times out, it resets itself and outputs it to the time-up counter 16. The time-up counter 16 counts the number of time-ups of the internal counter 12. Now, assuming that the internal counter 12 is timed up n times before the basic clock is once input from the power supply frequency detection unit 9 and then input again, the operation of the determination unit 14 will be described with reference to FIG. To do. First, FIG. 2 (a) shows the case where the value of the time-up counter 16 is n times until the basic clock is once input from the power supply frequency detection unit 9 and is input again. At this time, the judgment unit 14 judges that the time is normal and counts the external counter 13 and at the same time clears the contents of the time-up counter 16. Next, FIG. 2 (b) shows a case where the value of the time-up counter 16 until the basic clock is input once and input again is smaller than n. The basic clock of is judged to be abnormal and ignored. Finally, FIG. 3 (c) shows the case where the basic clock is input once, and then the value of the time-up counter 16 is not input even if it exceeds n times. When the value of 16 is n + 1, the external counter 13 is counted and the contents of the time-up counter 16 are cleared at the same time.

The timer unit 17 divides the content of the external counter 13 counted by the signal from the determination unit 14 by the above method, and operates as a clock.

As described above, according to the present embodiment, even if noise is applied to the commercial power supply and the cycle of the basic clock from the power supply frequency detection unit becomes abnormal, the influence of noise is minimized and the influence of noise is maximized. Even so, the deviation is the direction in which the clock extends, and the magnitude of the deviation can be predicted. Also, by shortening the time-up time of the internal counter 16,
The clock error can be kept within the variation of the microcomputer driving oscillator.

As described above, the present invention has an outlet for inputting a commercial power source, a power source frequency detection unit for detecting a frequency of the commercial power source from the outlet and generating a basic clock, and a commercial power source for rectifying the outlet, A microcomputer having a constant voltage unit for stepping down and stabilizing, an external counter that operates based on a stable power source from the constant voltage unit, a determination unit, an internal counter, a time-up counter, and a timer unit, and the microcomputer. When a basic clock from the power supply frequency detection unit and a microcomputer driving oscillator that supplies a driving clock to the microcomputer are input, the number of times the internal counter times up is divided by dividing the basic clock from the microcomputer driving oscillator. Compared with the contents of the time-up counter, If the content of the timer is less than the normal value, it is not counted, and only when the normal value or the time-up counter exceeds the normal value is counted up to the external counter, and at the same time, the determination unit that clears the content of the time-up counter, A timer unit that divides the contents of the external counter and acts as a clock is provided.Even if noise is applied to the commercial power supply and the cycle of the basic clock from the power supply frequency detection unit becomes abnormal, the effect of noise Even if the influence of noise is maximized, the deviation can be predicted in the direction in which the clock extends. Further, by shortening the time-up time of the internal counter, the deviation of the clock can be kept within the variation of the microcomputer driving oscillator.

[Brief description of drawings]

FIG. 1 is a block diagram of a counting device for a timepiece according to an embodiment of the present invention, FIG. 2 is an operation diagram of a determination unit in FIG. 1, and FIG. 3 is a block diagram of a conventional counting device for a timepiece. 8 ... Outlet, 9 ... Power frequency detector, 12 ... Internal counter, 13 ... External counter, 14 ... Judgment unit, 16 ...
… Time-up counter, 17… Timer section.

Claims (1)

[Claims] 1. A power outlet for inputting a commercial power source, a power source frequency detecting unit for detecting a frequency of the commercial power source from the outlet and generating a basic clock, and a commercial power source from the outlet for rectifying, stepping down and stabilizing the commercial power source. It operates based on a constant voltage unit and a stabilized power source from the constant voltage unit,
A microcomputer having an external counter, a determination unit, an internal counter, a time-up counter, and a timer unit, a microcomputer driving oscillator for supplying a driving clock to the microcomputer, and a basic clock from the power supply frequency detection unit are input. At this time, the contents are compared with the contents of the time-up counter that counts the number of times the internal counter has time-divided by dividing the basic clock from the microcomputer driving oscillator, and if the contents of the timer-up counter are less than the normal value, do not count, A judgment unit that counts up to an external counter only when it is normal or when the time-up counter exceeds a normal value and at the same time clears the contents of the time-up counter, and a timer that divides the contents of the external counter and acts as a clock. Watch counselor Apparatus.