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MSP430F5308 PU口不用的话，是不是LDO那里悬空就行，就是49 至54这6个脚悬空？
数据手册http://www.ti.com.cn/cn/lit/ug/slau208q/slau208q.pdf LDO-PWR Module部分有详细的介绍
您可以看一下
Table 1-3. Connection of Unused Pins(1)
