#pragma vector=NMI_VECTOR
#pragma type_attribute=__interrupt
void osc_fault(void)
{  
      BCSCTL2 = SELM_0 + DIVM_0 + DIVS_0;                       // DCO
      BCSCTL1 = DIVA_0 + RSEL2 + RSEL1 + RSEL0;               //ACLK=XT1/1=32768
      DCOCTL = DCO0 + DCO1 + DCO2;                                 //DCO 6 MHz
      while ((IFG1&OFIFG) != 0) IFG1 &= ~OFIFG;  

      BCSCTL2 = SELM_2 + DIVM_0 + SELS + DIVS_0;              //MCLK=XT2/1=8000
                                                                                             //SMCLK=XT2/1=
      IE1 |= OFIE;
}

int main( void )
{
    WDTCTL = WDTPW + WDTHOLD;         // Stop watchdog timer to prevent time out reset
    IFG1 |= OFIFG;                    // Set flag OFIFG
    IE1 = OFIE;                       // Enable IRQ from OSC fault
          
    adc_init();
    initTimerA();
    I2CInit();
    LCDInit();
    
    WDTCTL = WDT_ARST_1000;  // WDTPW+WDTCNTCL+WDTSSEL

    while(1)
    {


               [здесь выполняется некая процедура длительностью много меньше 1 с]


          WDTCTL = WDTPW + WDTCNTCL; // Clear watchdog cnt
    }
}

; Periodically clear an active watchdog
MOV #WDTPW+WDTCNTCL,&WDTCTL