数字时钟是一种用数字电路技术实现时、分、秒计时的装置，具有时、分、秒的计时；译码；输出七段码；最大计时23时59分59秒；整时报警功能。-Digital clock is a kind of when using a digital circuit technology, minutes and seconds timing device that has the hours, minutes, seconds of time Decoding Output of seven segment

59秒计时器，基于AT89C51，欢迎参考-59 seconds timer, based on AT89C51, welcome to reference