本设计以单片机AT89S52为切入点，通过使用AT89S52的内部的可编程定时器/计数器，结合对外接晶振的调节来确定一个合适的振荡周期，从而确定出内部的机器周期。再通过对内部中断程序的设置来设计出时钟程序，即设计出了电子时钟的核心。然后在核心电路的基础上设计出了相应的扩展电路，使本设计更加实用。(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.)