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msp430fr6972的uca0串口 ,用引脚P2.0,P2.1时正常,发送接收都没问题,但是使用P4.2,P4.3时,只能发送数据,无法接收数据,确认已经通过usb转串口发送数据出去了,但是单片机无法进入中断。中断函数为同一函数,只是使用的引脚不一样,不知道问题在哪里。