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咨询MSP430F5438重复打开和关闭串口出现问题

Other Parts Discussed in Thread: MSP430F5438

请问大师们,我试用MSP430F5438打开串口后,进入低功耗时关闭串口,再次打开串口时就出现问题了,停在发送标志位判断那里,这是怎么回事呢