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为什么在msp430的P5.4上测试不到MCLK时钟波形呢?

Other Parts Discussed in Thread: MSP430F235

#include  <msp430x23x.h>
void main(void)
{
  WDTCTL = WDTPW + WDTHOLD;        // Stop watchdog timer
   
  P5DIR |= BIT4;   //设置P5.4为输出与第二功能
  P5SEL |= BIT4;    //1为复用功能
  for(;;);
}

程序如上
然后在P5.4上测试波形应该是MCLK=800KHZ的时钟波形啊,为什么测试不到呢。
芯片型号为:msp430f235