Verifying the Timer counter register count value

Hello,

I am using the cc430f5137 with CCS5 and I am plannign to sample the ADC at 20Hz and using Timer1 in up_mode.

So,the timer1 TA1R should count upto the value of 52428 value I guess.But when a breakpoint was placed at

ADC12CTL0 |= ADC12SC; the Register TA1R in  timer1_A3 is showing only the values like 9,24,46,60 but it is not reaching the value of 52428(not even >100)

The main lines of code are 

Smclk=1048576.

void main( void )
{
// Initialize ADC12_A to sample ADC_channel_3
	  REFCTL0 = REFON;
	  REFCTL0&=~REFMSTR;
	  ADC12CTL0 = ADC12SHT0_4 + ADC12REFON + ADC12REF2_5V+ADC12ON;
	  ADC12CTL1 =  ADC12SSEL_3+ ADC12SHS_0 + ADC12SHP ;
	  ADC12CTL2 =   ADC12RES_2;
	  ADC12MCTL0 = ADC12SREF_1 + ADC12INCH_3;
	  P2SEL = BIT3;
	  ADC12IE = ADC12IE0;
	  ADC12CTL0 |= ADC12ENC;
	  
	  TA1CCR0 = Smclk/(20) - 1;
	  TA1CCTL0 = CCIE;
	  TA1CTL = TASSEL_2 + MC_1 + TACLR;	  
  while (1)
  {
		if(samples==19)
		{
			samples=0;
		}
		else
		{
			samples=samples+1;
		}
	
    __bis_SR_register(CPUOFF + GIE);//CPU OFF mode
  }
}

#pragma vector=ADC12_VECTOR
__interrupt void ADC12ISR(void)
{
	result=ADC12MEM0;
	__bic_SR_register_on_exit(CPUOFF);
}

#pragma vector=TIMER1_A0_VECTOR
__interrupt void TIMER1_A0_ISR(void)
{
	ADC12CTL0 |= ADC12SC;                        // Toggle P1.0
}

can someone explain the problem associated with this and how to check the Timer coutner value.
Thanks.