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下面一段msp430F437的时钟配置为什么不对

Other Parts Discussed in Thread: MSP430F437

下面一段msp430F437的时钟配置SMCLK 为XT2 ,MCLK 为XT2,为什么不对管脚输出看到的MCLK为DCO的频率???

unsigned int i;
  FLL_CTL0 |=  XCAP18PF;
  FLL_CTL1 &= ~XT2OFF;
  do
  {
    FLL_CTL0 &= ~XT2OF;
    for(i = 50000;i > 0;i--);
  }
  while(FLL_CTL0 & XT2OF);
  FLL_CTL1 = SELM_XT2 + SELS;