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1、请问CC2540的ADCCON2和ADCCON3有什么区别？
2、请问在同一个ADC通道内，单次转换和序列转换有什么区别？
单次转换只进行一次ADC转换，设置ADCCON2.SCH即选择通道
序列转换可以连续对几个通道进行ADC转换，对ADCCON2.SCH设置的值分3个区间，根据落在的区间划分功能
a, <=7，单通道输入, 从AIN0开始，ADCCON2.SCH设置的为最后一个通道，即AIN0开始转换截止到ADCCON2.SCH通道
b, 8-11，差分输入，从AIN0–AIN1开始，可以连续对几个差分输入通道进行转换
c, >=12，特殊电压，进行单次转换
