利用80C51单片机及数码管显示器设计一个简单电子时钟，由于用LED数码管显示数据，在夜晚或黑暗的场合里也可以使用，具有一定的实用性，通过软件扩展了时钟功能，使之成为带定时闹铃的时钟和倒计时的时钟。-Using 80C51 microcontroller and digital control design of a simple electronic clock display, as with the LED digital display data, at night or dark places where you can use, with some practical, functional software extends the clock, making it with regular alarm clock and countdown clock.