An electronic clock is a timing device that displays “hours”, “minutes” and “seconds” in the human visual organs. Its timing period is 24 hours, the full-scale display is 23:59:59, and it has the function of correcting the time and reporting the time. Therefore, a basic digital clock circuit is mainly composed of decoding display, “hour”, “minute”, “second” counter, time correction circuit, time signal circuit, and oscillator.
The main circuit system is composed of a second signal generator, an “hour, minute, second” counter, a decoder and a display, a time correction circuit, and a whole point timekeeping circuit. The second signal generator is the time base signal of the entire system. It directly determines the accuracy of the timing system. It is generally realized by a quartz crystal oscillator and a frequency divider.
The standard second signal is sent to the “second counter”, the “second counter” adopts a 60-ary counter, and a “minute pulse” signal is sent out every 60 seconds accumulated, and this signal will be used as the clock pulse of the “minute counter”.