[求助] 430 I/O中断疑问

zhanghuaihe01 2013-5-13 10:55 楼主

#include

int main(void)
{
  WDTCTL = WDTPW | WDTHOLD;                // Stop watchdog timer
  P1DIR |= BIT0;                         // Set P1.0 to output direction
  P1OUT &= ~BIT0;
  P1REN |= BIT4;                         // Enable P1.4 internal resistance
  P1OUT |= BIT4;                         // Set P1.4 as pull-Up resistance
  P1IES &= ~BIT4;                         // P1.4 Lo/Hi edge
  P1IFG &= ~BIT4;                         // P1.4 IFG cleared
  P1IE |= BIT4;                            // P1.4 interrupt enabled

  while(1)
  {
__bis_SR_register(LPM4_bits |GIE);    // Enter LPM4 w/interrupt
__no_operation();                      // For debugger
P1OUT ^= BIT0;                      // P1.0 = toggle
P1IES ^= BIT4;                         // Toggle between H-L and L-H transition triggers
P1IE |= BIT4;                         // Enable port interrupt
  }
}

// Port 1 interrupt service routine
#pragma vector=PORT1_VECTOR
__interrupt void Port_1(void)
{
  P1IFG &= ~BIT4;                         // Clear P1.4 IFG
  P1IE &= ~ BIT4;                         // Clear P1.4 IE
  _BIC_SR_IRQ(LPM4_bits);                // Exit LPM4
}

此是430 5系列的MCU的库,如果P1.4是个按键,在单步执行时能否顺利到达P1.4的中端入口？
我试了很多次都是不行,请教原因？