JPS60155992A - Electronic timer - Google Patents

Abstract

PURPOSE:To achieve a less number of parts and a higher reliability by counting synchronous signals from a timing controller to perform a time counting operation. CONSTITUTION:Output of an oscillator 14 having a crystal oscillation element 5 is divided in six with a counter 9 and fed to a control circuit 16 as timing control signal for the circuit as a whole. The output of the counter 9 is further divided with a prescaler 10 and counters 11 and 12 allowed to be set as desired on a program in a memory circuit 8. The control of a timer control circuit 1 shifts to a time counting processing with the overflow of the divider. Then, the circuit 1 generates output to a display circuit 3 depending on time information prepared within the control circuit while compares information of a temporary memory 13 and the time information to determine 15 and sends out a control signal.

Description

[Detailed description of the invention] [Field of application of the invention] The present invention relates to time counting processing by a timer.

[Background of the invention]

FIG. 1 shows a block diagram of a conventionally used timer circuit. The explanation will be given below using FIG. 1. The clock information is created in the clock circuit 6, and the timer control circuit 1 compares and determines the information in the internal temporary storage device with the information from the clock circuit and outputs a control signal. Also, an output to the display circuit 3 is created based on the input from the clock circuit 6. 'The conventional system described above requires the clock circuit 6 and the timer control circuit 1 separately, which naturally requires a large number of parts, low reliability, and high power consumption.

[Purpose of the invention]

An object of the present invention is to eliminate the above-mentioned drawbacks of the prior art, reduce the number of parts, improve reliability, and provide a small and inexpensive electronic timer that saves power.

[Summary of the invention]

The present invention eliminates the conventional clock circuit dedicated to timekeeping, and performs timekeeping operations by counting synchronization signals from a timing control device using an arithmetic processing unit included in an electronic timer.

[Embodiments of the invention]

An embodiment of a timer circuit according to the present invention will be described below using a block diagram. In FIG. 2, the timer control circuit 1 performs a timekeeping operation by counting down the output frequency of the oscillation circuit for synchronization timing of the entire timer circuit, and transmits the time information to the display circuit 3 based on the time information created by the control circuit circle. It creates an output, compares and determines the information in the temporary storage device and the time information, and outputs a control signal.

FIG. 6 shows a block diagram of the timer control circuit.

This will be explained below using FIG. A crystal oscillator 5 shown in FIG. 2 is connected to an oscillator 14 and oscillates, and the oscillation frequency is supplied to a state counter 9, which divides the frequency by the counter 9Vc and becomes a timing control signal for the entire circuit. supplied to Further, the output of the counter 9 is frequency-divided by a grease cooler 10 and counters 11 and 12 whose recognition can be set by a program in the memory circuit 8. This overflow of the branch divider causes the control of the timer control circuit to shift to timekeeping processing. Timing processing is done by counter 11
．． 12 settings and the process of advancing the time is performed. When processing is complete, control is returned to normal. In this timekeeping system, the crystal oscillator is not limited to a specific frequency; for example, a crystal oscillator having the frequency of a television color signal carrier wave can be used. The accuracy of time measurement will be explained below using an actual numerical example when using the television color signal carrier frequency. 6.579
The TV color signal frequency of 545 MHz is divided by 1/2 in the rooting circuit 14 and becomes 1.789773 MHz.
Furthermore, the frequency is divided by 1/6 by the state counter 9 to 298
．． It becomes 295KHz. This is 1 risk 10. Counter ti is divided by 12 by 1/254 to 1165.
22H2. This is stored in the temporary storage device 16. 1/6 by rotating 1/69913 times by the arithmetic processing unit 15
As 0H2, one minute can be obtained with an accuracy of +6.5 seconds per month. Further, divide the frequency of the final stage of the parsimonious part to 1/6
Make it 9914.

This makes it possible to achieve an accuracy of +1.75 seconds per month. Below, the error is hourly, daily, and weekly.

By making a correction, it is possible to reduce the error by one month to OVc.

In the above timer, the pl scale 210 is reset by the explanation of the counters 11 and 12.

In case of VC, it is possible to measure time with almost the same accuracy.

If the frequency of the crystal oscillator is 3.579904MH2, the oscillation circuit 14 divides the frequency by 1/2, the state counter 9 divides the frequency by 1/6, and the grease cooler 10 divides the frequency by 1, without having to set the counter 11.12 every time it overflows. /62 frequency division, counter 12 divides the frequency by 1/'16, h') 7ta 11
fl/16 frequency division nft 18.21) I2 is stored as 172185 by the temporary storage device 1 and the arithmetic processing unit 15.
1/5OHZ (!: L -(
Can measure one minute. This will result in a monthly difference of 0 seconds.

〔Effect of the invention〕

As a result of the present invention, it is possible to reduce the number of timer parts and improve reliability, and furthermore, by making the circuit configuration smaller, power consumption can be significantly reduced. In addition, it is possible to use a crystal that is already available in mass production equipment, for example, a crystal with a television color signal carrier frequency, or a crystal with a frequency that can be produced in almost the same process as that, which is highly effective in mass production. Furthermore, by applying the method of the present invention to a microcomputer, a timer that is highly accurate, inexpensive, and compact can be easily realized in a short period of time.

[Brief explanation of the drawing]

FIG. 1 is a block diagram of a conventional electronic timer, FIG. 2 is a block diagram of an electronic timer of the present invention, and FIG. 6 is a block diagram of the timer control circuit of FIG. 2. DESCRIPTION OF SYMBOLS 1...Tie control circuit, 5...Crystal oscillator, 6...Clock circuit, 9...State counter, 10...7'' recooler, 11...Counter TL. 12...Counter TH0 Fig. 1 Fig. 2

Claims (1)

[Claims] A non-volatile memory that permanently stores the program in a timer that stores the procedures for time measurement, time coincidence judgment 1 display and input/output processing to output signals that control the equipment connected to the timer, and performs arithmetic processing. A computer, an arithmetic processing device that performs arithmetic processing using the program, an input device that inputs information such as time adjustment and reservation settings, a temporary storage device that stores information from the input device and timekeeping information, etc. a counter that can set a time for recognition; an output device that outputs control signals, display signals, etc.;
An electronic timer comprising a timing control device for synchronizing the entire device, and performing a timekeeping operation by counting a synchronization signal from the timing control device by the counter.