ADC实例，用于模拟量采样实例，内部REF(The system is clocked by the internal 24.5 MHz oscillator divided by 1. // Timer 2 triggers a conversion on ADC0 on each overflow. The completion of // this conversionin turn triggers an interrup

EFM8BB2的一些能在keil 环境下运行都测试过得例程(Some of the EFM8BB2 can run in the Keil environment to test the routines)