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请教一下:关于msp430g2433外部晶振XT2的问题!!!!!

我外接了一个外部8MHz的晶振,连到引脚P2.6 P2.7上,

BCSCTL1 &= ~XT2OFF;      // 打开XT2晶振
  BCSCTL1 |= XTS;
  BCSCTL2 |= SELM1+SELS;
  BCSCTL3 |=XT2S1;
   

用示波器看了一下主频,只有0.1MHZ,当我把RSEL3置1,主频能达到1MHZ,不知道是不是我配置有问题??