MSP430FR2355: LMP4.5 exit issue

Hi,

I am trying to generate a LMP4.5 exit however the device never detects the interrupt on my PCB.

I have the MCU to go into deep sleep mode (LMP4.5) and as soon as I press a switch on pin 2.4 to come out of this mode.

My code is as follows:

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

 P1DIR = 0xFF; P2DIR = 0xFF; P3DIR = 0xFF; P4DIR = 0xFF; P5DIR = 0xFF; P6DIR = 0xFF;
 P1REN = 0xFF; P2REN = 0xFF; P3REN = 0xFF; P4REN = 0xFF; P5REN = 0xFF; P6REN = 0xFF;
 P1OUT = 0x00; P2OUT = 0x00; P3OUT = 0x00; P4OUT = 0x00; P5OUT = 0x00; P6OUT = 0x00;

 // Disable the GPIO power-on default high-impedance mode
 // to activate previously configured port settings
 PM5CTL0 &= ~LOCKLPM5;

 // Configure 16MHz XTAL
 // Configure one FRAM waitstate as required by the device datasheet for MCLK
 // operation beyond 8MHz _before_ configuring the clock system.
 FRCTL0 = FRCTLPW | NWAITS_1;

 CSCTL6 |= XTS + XT1HFFREQ_2;                // Select XT1 HF mode
                                                      // Set the appropriate high frequency for the crystal @16MHz
 CSCTL4 = SELMS__XT1CLK | SELA__REFOCLK;     // Set MCLK = XT1CLK = 4MHz
                                                      // XT1CLK = MCLK and SMCLK source

 P2SEL1 |= BIT6 | BIT7;                      // P2.6~P2.7: crystal pins
 do
 {
   CSCTL7 &= ~(XT1OFFG | DCOFFG);      // Clear XT1 and DCO fault flag
   SFRIFG1 &= ~OFIFG;
 } while (SFRIFG1 & OFIFG);              // Test oscillator fault flag
 CSCTL5 |= DIVM_0 | DIVS_1;              // MCLK = XT1CLK = 16MHZ,
                                         // SMCLK = MCLK/2 = 8MHz



      // Determine whether we are coming out of an LPMx.5 or a regular RESET.
        if (SYSRSTIV == SYSRSTIV_LPM5WU)        // MSP430 just woke up from LPMx.5
        {
            //Do nothing let the FW run

        }  else
           {

               // Device powered up from a cold start.
               // It configures the device and puts the device into LPM4.5
               
               P2DIR &= ~(BIT4);                   // Configure P2.4 as input direction pin
               P2OUT &= ~(BIT4);                   // Configure P2.4 as pulled-down
               P2REN |= BIT4;                      // P2.4 pull-up register enable
               P2IES &= ~(BIT4);                   // P2.4 Low/Hi edge
               P2IFG = 0;                          // Clear all P2 interrupt flags
               P2IE |= BIT4;                       // P2.4 interrupt enabled

               // Explicitly clear RTC control registers to disable it
               // just in case if the RTC was previously enabled
               disable_RTC();

                        

               PMMCTL0_H = PMMPW_H;                // Open PMM Registers for write
               PMMCTL0_L |= PMMREGOFF;             // and set PMMREGOFF
               PMMCTL0_H = 0;                      // Lock PMM Registers


               // Enter LPM4 Note that this operation does not return. The LPM4.5
               // will exit through a RESET event, resulting in a re-start
               // of the code.
               __bis_SR_register(LPM4_bits | GIE);
           }
    
// Main program
    while(1)
{

}
 

The above enters in LMP4.5 and while debugging and applying a reset on reset pin it detects but does not detect the Pin2.4 interrupt. What am I doing wrong?

Thanks,

Vlad