how to stop timer0

[deepakomanna]

Dear Sir,
here i am using 12f629, MPLAB 7.5 Ver. & CCS PCM C Compiler, Version 3.249, 34534.
if i want to stop timer 1 i have statement like this
SETUP_TIMER_1(T1_DISABLED);

Then if i want to stop timer 0 ,what i have to do?
i checked 12f629.h file i found only
#define T1_DISABLED 0

plz reply
_________________
Thank You,
With Best Regards,
Deepak.

[RossJ]

Timer 0 on most (all?) PICs prior to 18 series doesn't have the option to stop. You can check the datasheet for your PIC to confirm this. Obviously the compiler can't stop the timer if the PIC itself doesn't support doing so.

The main reason for stopping a timer is for power conservation reasons. Perhapt this is why the option was added to PIC18.

[deepakomanna]

Then if want to stop timer0 then how it is possible
_________________
Thank You,
With Best Regards,
Deepak.

[RossJ]

Turn off the power or hold the PIC in reset with MCLR. I guess neither solution is satisfactory

What is the actual reason you wish to stop the timer? Perhaps there is another way to solve that problem.

[deepakomanna]

here i sensing to pulses at GPIO 0 & GPIO 1,like this.
while(INPUT(PIN_A0)); // 1 st pulse

while(INPUT(PIN_A1)); // 2nd pulse
so whenever 2nd pulse comes i have to keep GPIO 5 low for 1.35 msec.
So by using delay i done this,but i don't want to waste time,
OUTPUT_LOW(PIN_A5);
DELAY_US(1300);
OUTPUT_HIGH(PIN_A5);
so i want to use timer0,& timer1 is used for another purpose.
whenever 2nd pulse comes i want to start timer0 & GPIO 5 low.
SETUP_TIMER_0(RTCC_INTERNAL|RTCC_DIV_128);
OUTPUT_LOW(PIN_A5);
And in interrupt routine i want to make GPIO 5 high & stop timer0
_________________
Thank You,
With Best Regards,
Deepak.

[RossJ]

Okay, that's pretty straight forward...

You don't actually need to stop the timer, just ignore it (as it will keep rolling over periodically).

1. Setup the timer at some convenient place (only needs to be done once).
2. After you output_low, use set_timer0() to set an appropriate starting value. The timer will continue counting up from that value.
3. Enable the timer0 interrupt.
4. When the timer rolls over the interrupt is generated and you disable timer0 interrupt and output_high (within the interrupt service routine).
5. The timer continues counting but since you have disabled the interrupt and so long as you don't read the timer's value, you will never notice.
6. Repeat from 2 as required.

[Ttelmah]

Add one thing to the above.
After setting the timer, clear the interrupt, before enabling it. The problem is that the timer _will_have rolled over in the period between when it was last used, so the interrupt flag _will_ already be set.

Best Wishes