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MSP430F149从上电到完成复位这个过程中，I/O端口处于输入状态还是输出状态？，电平是高还是低？
复位后，io是输入状态。具体是高电平还是低电平和外部电路有关
我是想知道从上电开始到完成复位之间这段时间I/O的状态及电平
高阻抗，無輸出，也不能輸入。
