该程序用事件管理器B的定时器4定时时间来触发A/D采样的启动。采样时采用级联模式，一次做16个转换，转换通道分别是0~15。转换完成后，在A/D中断服务子程序中将转换结果读出。该程序做一次A/D采样。

-The program manager with the events of the timer 4 timing B to trigger A/D sampling start. Sample used in cascade mode, do a 16 conversion, conversion channel is 0 ~ 15. Conversion is completed, the A/D conversion interrupt service subroutine will read out the result. The program do a A/D sampling.