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。-Digital clock, respectively, in the six digital tube display time-seconds, and can be the first one by an independent keys (k1) for time to adjust, that is, more than 0.5 seconds if