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?
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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?
上电后设置管脚为输入的话是高阻态,管脚电平不确定,有高有低,低的概率大一些而已.
不建议这样使用。