设置功能选择开关和相应的操作按键，时钟用6位数码管分别显示时、分、秒。做跑表时显示分、十秒、百毫秒、十毫秒和毫秒。 -Set function selector switch and the corresponding operating button, the clock with six digital tube, respectively, show hours, minutes and seconds. Stopwatch to do when the show hours, 10