说明：  这个是实时时钟芯片DS1302的驱动程序，采用c51编写，编程时只需要修改一下SCL,IO,RST的引脚定义即可，经过测试，完全好用
(This is a real-time clock chip DS1302 driver, using C51 preparation, programming, only need to modify about SCL, IO, RST pin can be defined, tested and fully use)