void TimerInit(void)
{
// timer A init
TACCR2 = 0x00;
TACTL = TASSEL_2+TACLR;       // SMCLK, clear TAR, UP timer mode, int enable, /1
TACCTL0 |= CCIE;                      // CCR0 interrupt enabled
TACCTL1 = 0x00;
TACCTL2 = 0x00;
TACCR0 = SMCLK_FREQ_HZ/FREQ_INTERRUPT;
TACTL &= ~TAIFG;
TACCTL0 &= ~CCIFG;
TACTL |= MC_1+TAIE;
// timer B init
TBCCR2=0x00;
TBCTL = TBSSEL_1+TBCLR+ID_2;       // ACLK, clear TAR, UP timer mode, int enable, /4
TBCCTL0 |= CCIE;                      // CCR0 interrupt enabled
TBCCTL1 = 0x00;
TBCCTL2 = 0x00;
TBCCTL3 = 0x00;
TBCCTL4 = 0x00;
TBCCTL5 = 0x00;
TBCCTL6 = 0x00;
TBCCR0 = ACLK_FREQ_HZ;
TBCTL &= ~TBIFG;
TBCCTL0 &= ~CCIFG;
TBCTL |= MC_1+TBIE;
}

#pragma  vector=TIMERA0_VECTOR
__interrupt void Timer_A0_Int(void)
{
...
return;
}

#pragma  vector=TIMERB0_VECTOR
__interrupt void Timer_B0_Int(void)
{
...
  return;
}

TACTL = TASSEL_2+TACLR;       // SMCLK, clear TAR, UP timer mode, int enable, /1
...
TACTL |= MC_1+TAIE;
...
TBCTL = TBSSEL_1+TBCLR+ID_2;       // ACLK, clear TAR, UP timer mode, int enable, /4
...
TBCTL |= MC_1+TBIE;
...
из h-ника
#define TASSEL_2            (2*0x100) /* Timer A clock source select: 2 - SMCLK */
#define TBSSEL_1            (1*0x0100)  /* Clock Source: ACLK  */