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MSP430FR5994 是不是有32个通道的内部ADC，如何使用某一通道采集外部给的信号（例如正弦波）？采样率可以设置吗？
ADC12_B模块最多有32个通道。但MSP430FR5994只有16~20个通道（和具体封装有关）。
msp430ware里有adc相关的例程，楼主可以参考。可以根据需要设置采样频率
