本例采用自动方式即定时器A溢出执行ADC转换，通过A/D将MIC_IN输入的语音信号转换为数字信号，再通过D/A的两个通道AUD1和AUD2播放。-The use of automated means in this case that the implementation of the timer A overflow ADC conversion, through the A/D input to the speech signal MIC_IN converted to digital signals, and then through the D/A and the two channels AUD2 player AUD1.