CCS/msp430fr4133: Timer 0 not working as supposed!!

Part Number: MSP430FR4133

Tool/software: Code Composer Studio

Hi all,

I'm trying to implement a simple routine to toggle one Led every 10s.

For that, i would like to set the source ACLK which in this lunchpad is 32.768 kHz, in continuous mode and Input divider 1.

Timer(s) = 65535/ 32768 =~ 2s

Each overflow would occur within 2s. The problem is that, what i'm seeing is the the toggle frequency much lower than this. Can someone help me?

This is the code:

#include <msp430.h>
#include <hlcd.h>

unsigned Global_Timer0_Count = 0;
unsigned Global_Count = 0;

int main( void )
{
WDTCTL = WDTPW | WDTHOLD; // Stop watchdog timer

TA0CTL |= TACLR;

TA0CTL |= MC_2 | TASSEL_1 | ID_0;

TA0CTL |= TAIE;

P1DIR |= BIT0; // P1.0 is Led output
P1OUT = 0x01; // Set led on

PM5CTL0 &= ~LOCKLPM5;

__enable_interrupt();

__bis_SR_register(GIE); // LPM0 with interrupts enabled

while (1)
{

}

}

// Timer A0 interrupt service routine
#pragma vector = TIMER0_A1_VECTOR
__interrupt void TIMERA0_ISR0(void)
{

Global_Timer0_Count ++;

if(Global_Timer0_Count == 5){

P1OUT ^= 0x01; // Toggle P1.0 using exclusive-OR
Global_Timer0_Count = 0;
TA0CTL &= ~BIT0;

}