2-inch LCD digital circuit

The C1200 clock circuit made of a large-scale integrated circuit computer system has the functions of time setting, second, minute and hour division, seven-segment decoding, display driver and switch. The four-digit LCD panel is MGC-50. S1 and S2 advance the minutes or hours at a 2Hz rate. To enable it to be used as an indicator of the passage of time, S1 and S2 generate reset pulses simultaneously, bringing the specified time to zero.