1）电子实时时钟/万年日历系统 2）自发自收串行通信 -1) Electronic real-time clock/calendar system, 2 years) received spontaneously from the serial communication

在PCF8563实现电子实时时钟功能,基于PCF8563的I2C日历时钟芯片-Electronic real-time clock function, based on PCF8563 I2C calendar clock chip in PCF8563