强大的多功能电子时钟电路图和程序 做一个多功能电子时钟，除了通常具有的时间、公农历显示，定时闹钟、晚上自动开背光灯的功能以外，再增加节日提醒和日程提醒功能。 -The powerful multi-functional electronic the clock circuit diagrams and procedures to do a multi-functional electronic clock, in addition to usually have the time, th