msp430 timer used as rtc misbehaves

Hi all,

I'm trying to implement a real time clock using timer a, using an msp430 g2744.

I'm using an external 32.768 kHz oscillator with 12.5pF on each of it's legs.

After I config the clock and the timer,

instead of entering the ISR, the code seems to reset every 1 second (go back to beginning of main function).

I was hoping to get some help on the issue,

Here are my configurations:

void setClk()
{
  BCSCTL3 |= LFXT1S_0 + XCAP_0; // 32768-Hz crystal on LFXT1 + Oscillator capacitor selection
  DCOCTL = 0; // Select lowest DCOx and MODx settings
  BCSCTL1 = CALBC1_1MHZ; // Set DCO
  DCOCTL = CALDCO_1MHZ;
}

void startRTC()
{
  TACCTL0 = CCIE; // TACCR0 interrupt enabled
  TACCR0 =32768;
  TACTL = TASSEL_1 + MC_1 + TAIE; // ACLK, up mode
  g_RTC_Flag = ON;
}

And this is the ISR:

// Timer A0 interrupt service routine
#pragma vector=TIMER0_A0_VECTOR
__interrupt void Timer_A(void)
{
  //DEBUG_PRINT(("T ISR\n"));
  g_RTC_secondsCounter++;
  if (g_RTC_secondsCounter % 2)
  {
    set_LED_OFF(GREEN);
    set_LED_ON(RED);
  } 
  else
  {
    set_LED_OFF(RED);
    set_LED_ON(GREEN);
  }
}