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MSP430 DCO频率变化导致串口波特率出问题

Other Parts Discussed in Thread: MSP430G2553

我这边板子上用的是MSP430G2553,SMCLK为内部DCO   配置为16MHZ  ,设置完串口使用正常波特率9600,出口只与一片3485相连接;调试一会儿之后突然无法通信,经过测试,波特率在12000能正常通信,怀疑是内部DCO出问题了,但不明白为什么内部DCO会出问题》??求助