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msp430f149单片机 IO口选为输入,默认电平是低还是高?



假如MSP430上电,此时IO口默认是输入,我不对IO操作,那么此时是高电平还是低?
又假如上电后,我将P1改为输出,之后不对P1操作,那么电平默认是高还是低?