程序说明: 此程序首先对时钟芯片写入初值，延时后再读取时钟值，并年，月，日，时，分，秒 // 分别显示在LCD屏上。-Procedure Descr iption: This procedure first write the initial value of the clock chip, and then read the clock delay value, and year, month, day, hour, minute, second//, respectively, di