PIC18F2520与时钟芯片PCF8563的I2C例程序。此为测试版，有好多无用的参数/函数，根据自己情况修改。RB0:SDA RB1: SCL ，单片机:PIC18F2520，编译环境：MPlab+PICC18. I2C芯片: PCF8563 ，软件模拟I2C总线设置和读取时钟芯片。工程包括5个文件：delay.h delay.c I2c.h I2c.c I2c_demo.c 是用PICC18提供的I2C例程，用的内部时钟，仅供参考，好多参数没优化，特别是延时和内部时钟。

-PIC18F2520 and the clock chip PCF8563 I2C-amendment process. This is a test version, there are a lot of useless parameters/functions, according to its own changes. RB0: SDA RB1: SCL, MCU: PIC18F2520, build environment: MPlab+ PICC18. I2C chips: PCF8563, software simulation set-up and read the I2C-bus clock chip. The works include five files: delay.h delay.c I2c.h I2c.c I2c_demo.c is PICC18 provided I2C routines, using the internal clock, only for reference, not a lot of parameters optimization, in particular the delay and internal clock.