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 code　23 when the maximum timer 59 minutes and 59 seconds　When the alarm function.