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请教关于5510时钟倍频的问题



关于FLL倍频有一点没有搞清楚,请各位高手指教一下。

 UCSCTL0 = 0x0000;                         // Set lowest possible DCOx, MODx

  UCSCTL1 = DCORSEL_5;                      // Select DCO range 24MHz operation

  UCSCTL2 = FLLD_1 + 374;                   // Set DCO Multiplier for 12MHz    // (374 + 1) * 32768 = 12MHz

        我的问题是怎么能从   UCSCTL1 = DCORSEL_5;   这一句知道DCO的范围是24M啊。    如果是UCSCTL1 = DCORSEL_7;就是50M的范围。一直没有搞清楚这个问题。谢谢大家