MCU:c8051f040用自带的IIC控制器读写实时钟芯片PCF8563,该驱动代码接口简单,已完成BCD码到十进制码转换.-MCU: c8051f040 use IIC built-in controller to read and write real-time clock chip PCF8563, the driver code interface is simple, has completed the BCD code to decimal conversion code.