The electronic clock is a timing device that displays “time”, “minute”, and “second” in the human visual organ. It has a chronograph period of 24 hours and a full scale of 23:59:59. It has a timekeeping function and a timekeeping function. Therefore, a basic digital clock circuit is mainly composed of a decoding display, a “time”, a “minute”, a “second” counter, a timing circuit, a timekeeping circuit, and an oscillator. The main circuit system consists of a second signal generator, an “hour, minute, second” counter, a decoder and display, a timing circuit, and an hourly chime circuit. The second signal generator is the time base signal of the whole system, which directly determines the accuracy of the timing system, and is generally realized by a quartz crystal oscillator plus a frequency divider. The standard second signal is sent to the “second counter”. The “second counter” uses a 60-counter counter, and a “minute pulse” signal is sent every 60 seconds. This signal will be used as the “minute counter” clock pulse. The “minute counter” also uses a 60-counter counter. For every 60 minutes accumulated, a “time pulse” signal is sent, which is sent to the “time counter”. The “time counter” uses a 24-digit timer to achieve 24 hours of accumulation per day. The decoding display circuit decodes the output states of the “time”, “minute”, and “second” counters with a seven-segment display decoder and displays them through a seven-segment display. The hour signal circuit generates a pulse signal according to the output state of the timing system and then triggers an audio generator to realize the timekeeping. The calibration circuit is used to correct the numbers of “time”, “minute”, and “second”.