说明：  编译时请将个头文件 添加在一起 ， 该程序实现 可调的电子钟，没有使用时钟芯片，对时分秒，年月日，星期 都可以调，还有掉电保护的功能，新手看看
(Compile-time file with your head, the program to achieve adjustable electronic bell, do not use the clock chip, minutes and seconds of time, date, week, can be transferred, as well as brown-out protection function, new look)