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MSP430F5438A 串口高波特率设置问题



我设置的串口时钟源是20MHZ,根据手册参考波特率最高是460800,我想要设置为921600,根据手册的计算方法采用过采样模式,UCBRx和UCBRFx的值可以计算出来,但是UCBRSx应该怎样计算,手册中没有看到,有人知道可以说一下嘛,十分感谢!