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msp430lanunchpad P1口问题

Other Parts Discussed in Thread: MSP430G2553

之前我问过用P1口驱动液晶不行,但是P2口就可以使用,现在我进一步发现使用P1.0,P1.1,P1.2,P1,5驱动不行,但是使用P1.0,P1.1,P1.3,P1.5就可以驱动,这就表明了是P1.2的问题,于是问题到底是什么?希望知道者能告知。谢谢!!!