说明：  本作息时间控制设计采用51系列的微处理中的定时器定时。采用定时器中断方式，控制键盘及6位LED显示，显示时、分、秒。并且及时对时间进行调整。可实现定时、打铃、准确走时功能，能够按照学校作息时间实现自动打铃。
(Time control design uses the rest of the microprocessor 51 in the timer timing. Using the timer interrupt mode, control the keyboard and 6 LED display, showing hours, minutes and seconds. And time to time to adjust. To achieve timing, rang the bell, accurate travel time functions, in accordance with the school schedule automatic ringing.)