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！
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