MSP430G2553: Frequency meter code

#include <msp430g2553.h>

/*** Global variables ***/
volatile unsigned int CounterValue = 0;
volatile unsigned int StoredCount = 0;
unsigned int Result = 0;

int main(void) {

	/*** Watchdog timer and clock Set-Up ***/
	WDTCTL = WDTPW + WDTHOLD;		// Stop watchdog timer
	BCSCTL1 = CALBC1_8MHZ;  		// Set range
	DCOCTL = CALDCO_8MHZ;   		// Set DCO step + modulation
	
	/*** GPIO Set-Up ***/
	P2DIR &= ~BIT0;				// P2.0 set as input
	P2SEL |= BIT0;				// P2.0 set to primary peripheral Timer1_A

	/*** Timer_A Set-Up ***/
	TA0CCR0 = 20000;			// 20000*400 = 8000000 or 8MHz
	TA0CCTL0 |= CCIE;			// Interrupt enable
	TA0CTL |= TASSEL_2;			// SMCLK

	TA1CCTL0 |= CCIE + CCIS_0 + CM_2 + CAP;	// Interrupt enable, capture select CCIxA, Positive edge, capture mode
	TA1CTL |= TASSEL_2;						// SMCLK

	_BIS_SR(GIE);				// Enter LPM0 with interrupts enabled

	while(1)
	{

	TA0CTL |= MC0;				// Start timer
	TA1CTL |= MC1;				// Start timer
	while(CounterValue != 400);	// Wait while CounterValue is not equal to 400
	TA0CTL &= ~MC0;				// Stop timer
	TA1CTL &= ~MC1;				// Stop timer
	Result = StoredCount;		// Store frequency in Result
	CounterValue = 0;			// Zero CounterValue
	StoredCount = 0;			// Zero StoredCount
	TA0R = 0;					// Zero Timer_A0 register
	TA1R = 0;					// Zero Timer_A1 register
	}
}

//Timer_A0 TACCR0 Interrupt Vector Handler Routine
#pragma vector=TIMER0_A0_VECTOR
__interrupt void Timer0_A0(void)
{
	CounterValue++;
}

//Timer_A1 TACCR0 Interrupt Vector Handler Routine
#pragma vector=TIMER1_A0_VECTOR
__interrupt void Timer1_A0(void)
{
	StoredCount++;
}