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MSP430FR6972 LPM3

  我焊接了一块最下系统的6972,程序配置了时钟和所有IO口,io口配置为上拉输入,然后进入lpm3,仍然有45uA的电流,进入lpm4则只有1uA不到的电流,不知道LPM3有什么问题