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为什么我不能拉低管脚

wu yue
Prodigy 240 points
Other Parts Discussed in Thread: MSP430F2419

我用的单片机要 MSP430F2419

int main(void)
{
WDTCTL = WDTPW + WDTHOLD; // Stop watchdog timer

  while(1)
｛
      P1OUT &= ~0x02;
  }

}

为什么p1.1的管脚无法拉低？