NUC1xx 的 I2C总线挂接RTC芯片PCF8563，本例程通过I2C外设读写PCF8563、启动PCF8563片内时钟和闹钟。-NUC1xx I2C bus articulated RTC chip PCF8563, the routine through the the I2C peripheral read and write PCF8563, start PCF8563 chip clock and alarm clock.