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user guide 中这样说明：
你用的什么型号？要看具体型号的datasheet。
比如fr5994：
http://www.ti.com.cn/cn/lit/ds/symlink/msp430fr5994.pdf
里面P2.0有6种功能，在91页，对六种功能的寄存器配置都有说明
谢谢啦，明白了，以前没注意看这章节
