通过电子 定时器定时 到1s给一个中断 让单片机去执行中断 跳转至相应的数码管位 然后修改当前显示值 再设置到10进位加一 之后就出来数字时钟的效果-Through the electronic timer 1s to a microcontroller to　 the interrupt interrupt to jump to the corresponding bit digital tube and then modify the current display value is set to 10 and then carry out the effect of digital clock