数字钟是采用数字电路实现对“时”、“分”、“秒”数字显示的计时装置。数字钟的精度、

稳定度远远超过老式机械钟。在这次设计中，我们采用数码管显示时、分，以24

小时计时方式，根据数码管动态显示原理来进行显示，用12MHz的晶振产生振荡脉冲，定

时器计数。在此次设计中，电路具有显示时间的其本功能，还可以实现对时间的调整，并且具有定时闹铃功能。-Digital Clock is a digital circuit implementation timing device on the " hour" , " minute" , " second"　digital display. Digital clock accuracy, stability far more than the old mechanical clock. In this design, we use digital display, minutes, to 24 hours time mode, according to the principles of digital tube dynamic display to display, with a 12MHz crystal oscillation pulse, the timer count. In this design, the circuit has a display time of its present function, you can also realize the time to adjust, and has a timing alarm function.