本实验实现的是数字钟，分别在6位数码管上显示分时秒，并且可以通过第1个独立按键（k1）进行时间调整，即如果按键按下超过0.5秒则进行时间分秒的调整。-Implementation of this experiment is a digital clock, digital control at 6 show time-seconds, and can be No. 1 independent keys (k1) for time adjustment, that is, if the butto