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 the button is pressed for time every second adjustments.