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msp430f5438a的输入输出原理图，当设置为输出时，上下拉设置无效，后面与dvcc和dvss的连接是断开的，设置高电平有效？和程序设置有矛盾，这里示意图是不是错了？
很少看那个示意图。具体寄存器配置要以MSP430x5xx and MSP430x6xx Family User's Guide 为准
