本文件是I2C总线时钟读写程序，使用外部22.1184MHz晶振.功能：为待机界面。按 A 键从时钟芯片读取当前时间，并在LCD上显示。按 F 返回显示待机界面。- This document is read and write I2C bus clock, the use of an external crystal 22.1184MHz function: a standby interface. Press A button reads the current time the