Introduction - If you have any usage issues, please Google them yourself
The AT89S52 single-chip design as the starting point, through the use of AT89S52 internal programmable timer / counter, combined with external adjustment resonator to determine a suitable period of oscillation, so as to determine the internal machine cycle. Then through the design of the internal interrupt program to design a clock program, that is, the design of the core of the electronic clock. Then the corresponding expansion circuit is designed on the basis of the core circuit, which makes the design more practical.