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我用msp430f5529, 老师告述我 I/O 口不能接负电压，为什么啊？
我在芯片手册上也没看到也没看到有写AD采样的最大电压限制啊，怎么办，多大合适呢？
单片机的电源为0-3.3V，他能够读取的范围最大也是0-3.3V，你加个负的电压，肯定不可以的，超过了MCU的电压范围
