MSP430 LPM4 wacht viel zu schnell auf

#include <msp430.h>

int main(void)

{

  //Initialize stage

  // Stop watchdog timer

  WDTCTL = WDTPW + WDTHOLD;

  // Defines Ports

  //Configure P3.1 Out for Measurement

  P3DIR |= BIT1;

  P3OUT &= ~BIT1;

  //Initialize Switch S1

  P3OUT &= ~BIT0;

  // P3.0 Lo/Hi edge

  P3IES &= ~BIT0;

  // P3.0 interrupt enabled

  P3IE |= BIT0;

  // P3.0 IFG cleared

  P3IFG &= ~BIT0;

  // P3.0 Pull-Down Resistor

  P3REN |= BIT0;

   for(;;)

   {

     __bis_SR_register(LPM4_bits + GIE);

   }

}

// Port 3 interrupt service routine

#pragma vector=PORT3_VECTOR

__interrupt void Port_3(void)

{

  //Set TEST PIN P3.1/A13 = HIGH

  P3OUT |= BIT1;

  //Clear Interrupt Register

  P3IFG &= ~BIT0;

  //Set TEST PIN P3.1/A13 = LOW

  P3OUT &= ~BIT1;

}