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| 设pclk=12mhz TSEG1≥TSEG2≥SJW;TSEG2≥1;PCLK/波特率=(TSEG1+TSEG2+3)*(BRP+1);
 采样率=1-(TSEG2+1)/(TSEG2+TSEG1+3);
 采样率范围:高:0.8-0.87;低:0.7-0.75;
 最大=pclk/[(TSEG1+TSEG2+3-(SJW+))*(BRP+1)];
 最小=pclk/[(TSEG1+TSEG2+3+(SJW+))*(BRP+1)];
 BRP=3,TSEG1=3,TSEG2=1,SJW=3,采样率=83.3%
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