Description: Abstract: microcontroller with a stable and reliable, small size, low price and so become the instrument of choice for the design of intelligent micro controller, so this design we use the AT89C52 chip, the microcontroller can use this section to its online software program, which Flexibility and reliability are relatively increased. The core of the design of the electronic clock is AT89S51 microcontroller, its internal memory with 4KB of Flash programmable microcontroller line, no external expansion program memory, the hardware circuit consists of four parts: a clock circuit, reset circuit, keyboard and display circuit. The frequency of the system clock oscillator circuit is used to 12MHz, timing counting the number is 5000, Timer 0 uses a timer to work in a regular way for the realization of the hours, minutes, seconds, chronograph, timer time is 5ms. Reset circuit can be restored to the original state of the electronic form. When the keyboard can be turned on spreadsheets, stop, but
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