Compiler/MSP430G2553: Timer value configuration issue in MSP430G2553

Hi Bhautik,

There are several G2553 timer examples in the Resource Explorer.

Thanks for the response.

I followed link that you have shared but In all timer based example based on cycle or assign value to CCR0.

But How can I calculate value for 1 sec or 2 sec, etc. timer delay?

If your SMCLK is running at 1MHz, and you set ID=3 (/8) and set CCR0=(65536-1) [as big as it gets], the timer will cycle in (65536*8)/1000000=about 524 ms, just over half a second. So getting a full second is not trivial. You could:

1) Set CCR0=62500-1 and ID=3, which will give you (62500*8)/1000000=0.5 seconds, then use an interrupt (TA0CCTL0:CCIE) to count to 2 half-seconds. You could probably adapt one of those Examples to do this.

2) Divide SMCLK by /2 using BCSCTL2:DIVS and set CCR0=62500-1 and ID=3. This has the unfortunate side-effect of changing all the other users of SMCLK, so I don't really recommend it.

3) If you're good (or even adequate) at soldering, enable the Launchpad's 32kHz crystal by moving R3/R9 according to the markings on the silkscreen. Then use TASSEL__ACLK and CCR0=32768-1 (and ID=0), which will give you a full second.

I think the only practical way to do 1 minute is by software.

[Edit: Showed my arithmetic. And then fixed a small mistake.]

Hi Bhautik,

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I have used below code for generate time for 10 sec. but I want to generate time for 5-6 min so how can i achieve that timer.

Let me know if any changes is require in below code.

// 10 seconds, assuming 32768 Hz ACLK source and divider 8
#define TIMER_PERIOD (10u * (32768 / 8))

void initTimer(void)
{
// reset timer A config (not strictly needed)
TACTL = TACLR;

// ACLK as clock source, divider 8, continuous mode, interrupt enabled
TACTL = TASSEL_1 | ID_3 | MC_2 | TAIE;

// set the period
TACCR1 = TIMER_PERIOD;

// enable capture/compare interrupts for CCR1
TACCTL1 = CCIE;

_enable_interrupts();

LPM1;
}

#pragma vector=TIMER0_A1_VECTOR
__interrupt void Timer_A(void)
{
switch (TAIV) {
case 0x02:
print("TIMER INTERRUPT \r\n");

P1OUT &= ~RED;
// set the time of the next interrupt
TACCR1 += TIMER_PERIOD;
break;
}
}

Thanks Dennis Lehman for your support