说明：  AT89C51的电子钟源程序和Protel电路图，该电路可以实现定时开关灯，整点报时，在线调整时间、日期、定时开时间和定时关时间
(AT89C51 electronic clock source and Protel circuit, the circuit can realize lamp timer switch, the whole point of time, on-line adjust time, date, time and from time to time to open from time to time clearance time)