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MSP430F5336的PJ口和PU口,怎么做GPIO使用?

编程方式采用SBW方式,LDO1接地,LDO0悬空,打算将PJ口和PU口作为GPIO使用,但是PJ口配置成输出后,看到寄存器中的值是所配的值,但是实际测量PJ口,发现PJ口一直为低电平。PU口不知道怎么配置。