CCS/msp430g2553: Starting timer from pin

The MC bits can be changed only from software.

But what is the actual problem you're trying to solve?

The problem itself is not that difficult. A pulse with measured length must be triggered after a falling edge of an input signal. I was hoping to bypass software as much as possible to avoid any chance of timing errors due to program execution.

When you use a timer output for the pulse, its length can be easily controlled.

Is the time between the input edge and the start of the pulse important?

Thank You for the answers!

The time between the edge and the start of the timer is important. I suppose, the right answer would be to use correct priorities of interrupts so nothing else will affect the triggering function. About using the timer output, I know that I the pin can be connected to timer with P1SEL command, but I have been struggling with single pulse output. I have only achieved flashing or constantly on states with that. Do I need to experiment with TACTL |= TAIE and the switch case interrupts?

For the past few days, I have tried to study the CCR interrupt, but only achieved desired result with following declarations:

  P1DIR |= BIT6;            //P1.6 output
  P1SEL |= BIT6;            //P1.6 TA1/2 options
  TACCTL0 |= CCIE;          //Enable Interrupts on Timer
  TACCR0 = 30;              //Number of cycles in the timer
  TACTL |= TASSEL_2;        //Use SMCLK as source for timer
  TACTL &= ~MC_1;           
  TACTL |= MC_0;
  TACTL |= ID_1;            //Divider
  TACCTL1 = OUTMOD_2;
  TACCR1 = 1;

At the moment I have no idea why my code did not work without TACCR1 = 1 and OUTMOD declarations. The following is in the interrupt sequence:

#pragma vector=TIMER0_A0_VECTOR
__interrupt void Timer_A0(void)
{
    TACTL &= ~MC_1;
    TACTL |= TACLR ;
 
}

Finally got the timer output module working with pin P1.5 and using OUTMOD_7. Somehow, without using OUTMOD, it did not output signal to the pin.  The working setup part of the code is following:

  P1DIR |= BIT5;                            // P1.5 output
  P1SEL |= BIT5;                            // P1.5 TA1/2 options
  TACCTL0 |= CCIE+OUTMOD_7;                 //Enable Interrupts and outmod
  TACCR0   = 30;
  TACTL   |= TASSEL_2;                      //Use SMCLK as source for timer                  
  TACTL   |= MC_1;
  TACTL   |= ID_2;

And the interrupt

// Timer_A interrupt service routine
#pragma vector=TIMER0_A0_VECTOR
__interrupt void Timer_A0(void)
{
   TACTL &= ~MC_1;
   TACTL |= TACLR ;
}