MSP430 exit LPM45 fails

void LPM5()

{

  PMMCTL0_H = PMMPW_H;                 // Open PMM Registers for write

  PMMCTL0_L |= PMMREGOFF;              // and set PMMREGOFF

  __bis_SR_register(LPM4_bits + GIE);  

}

[/]

Um ihn wieder aufzuwecken, habe ich Port 3.0 als Interrupt Eingang konfiguriert:

[code]

void init_ports()

{

  P3OUT &= ~BIT0;    // Initialize Input Value

  P3IES &= ~BIT0;    // P3.0 Low to High edge

  P3SEL0 &= ~BIT0;   //P3.0 selected as GPIO

  P3SEL1 &= ~BIT0;

  P3IE |= BIT0;      // P3.0 interrupt enabled

  P3IFG &= ~BIT0;    // P3.0 IFG cleared

  P3REN |= BIT0;     // P3.0 Pull-Down Resistor

}

#pragma vector=PORT3_VECTOR

__interrupt void Port_3(void)

{

  PMMCTL0_H = PMMPW_H;

  PMMIFG  |= PMMLPM5IFG;

  PMMCTL0_L &= ~PMMREGOFF;

  P3IFG &= ~BIT0;

  __bic_SR_register_on_exit(LPM4_bits);

}