MSP430F2274: Configuring timerA and timerB to extend the time before an interrupt

#include <msp430.h>

void configWDT(void);
void configClocks(void);
void configGPIO(void);
void configTimerA(void);
void configTimerB(void);
void configADC(void);

unsigned volatile int blink_cnt;
int main(void)
{
    blink_cnt = 0;
    configWDT();
    configClocks();
    configGPIO();
    configTimerA();

    while(1)
    {
        __bis_SR_register(LPM3_bits + GIE);             // Enter LPM3
        if(blink_cnt == 0 || blink_cnt > 0)
        {
            P1OUT ^= BIT0;
        }
    }
}


void configWDT(void)
{
    WDTCTL = WDTPW + WDTHOLD;
}


void configClocks()
{
    DCOCTL |= DCO1 + DCO0;
    BCSCTL1 |= XT2OFF + DIVA_3 + RSEL2 + RSEL1 + RSEL0;
    BCSCTL2 |= SELM_3 + SELS;
    BCSCTL3 |= XT2S_3 + XCAP_3;
}


void configGPIO(void)
{
    P1DIR |= 0x03;                            // P1.1 output
    P1SEL |= 0x02;                            // P1.1 option select

    P4DIR |= 0x06;                            // P4.1 and P4.2 output
    P4SEL |= 0x06;                            // P4.1 and P4.2 TB1/2 otions
}


void configTimerA(void)
{
    TACCTL0 |= OUTMOD_4;                       // TACCR0 toggle mode
    TACCR0 |= 0xFFFF;
    TACTL |= TASSEL_1 + ID_3 + MC_3 + TAIE;    // ACLK, up-downmode
}


void configTimerB(void)
{
    TBCCTL0 |= OUTMOD_4;
    TBCCR0 |= 0xFFFF;
    TBCTL |= TBSSEL_1 + ID_3 + MC_3 + TBIE;
}


// Timer_A3 Interrupt Vector (TAIV) handler
#if defined(__TI_COMPILER_VERSION__) || defined(__IAR_SYSTEMS_ICC__)
#pragma vector=TIMERA1_VECTOR
__interrupt void Timer_A(void)
#elif defined(__GNUC__)
void __attribute__ ((interrupt(TIMERA1_VECTOR))) Timer_A (void)
#else
#error Compiler not supported!
#endif
{
    switch(TAIV)        // Efficient switch-implementation
    {
        case  2:
            break;                        // TACCR1 not used
        case  4:
            break;                        // TACCR2 not used
        case 10:
            configTimerB();
            //blink_cnt++;
            break;
    }
    __bic_SR_register_on_exit(LPM3_bits);
}


// Timer_B3 Interrupt Vector (TAIV) handler
#if defined(__TI_COMPILER_VERSION__) || defined(__IAR_SYSTEMS_ICC__)
#pragma vector=TIMERB1_VECTOR
__interrupt void Timer_B(void)
#elif defined(__GNUC__)
void __attribute__ ((interrupt(TIMERB1_VECTOR))) Timer_A (void)
#else
#error Compiler not supported!
#endif
{
    switch(TBIV)        // Efficient switch-implementation
    {
        case  2:
            break;                        // TACCR1 not used
        case  4:
            break;                        // TACCR2 not used
        case 10:
            blink_cnt++;
            break;
    }
    __bic_SR_register_on_exit(LPM3_bits);
}