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timer1 on 12F683

 
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filjoa



Joined: 04 May 2008
Posts: 260

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timer1 on 12F683
PostPosted: Fri Jun 04, 2010 12:26 pm     Reply with quote
Hi

I like try start use timers but I don't find anywhere equations to calculate overflow happens.

Someone can explain to me how I can calculate timers interruption?

PS: Now I try to flash an LED (is possible flash with 1s?)...
Code:

#include <12F683.h>
#FUSES NOWDT, INTRC_IO, NOCPD, NOPROTECT, NOMCLR, PUT, NOBROWNOUT, NOIESO, NOFCMEN
#use delay(clock=8000000)

#define LED PIN_A5

int16 count = 0;

#int_TIMER1
void  TIMER1_isr(void)
{
   count++;
}

void main()
{
int8 aux = 0 ;

   enable_interrupts(GLOBAL);
   enable_interrupts(INT_TIMER1);
   setup_timer_1(T1_INTERNAL|T1_DIV_BY_1);
   
   
while(TRUE)
   {
         
    if (count >= 1000)
      {
       if (aux == 0)
               {
                 output_high(LED);
                 aux = 1;
                 count = 0;
                } else
                       {
                        output_low(LED);
                        aux = 0;
                        count = 0;
                       }
     
      }
   
     
   }
}


best regards
PCM programmer



Joined: 06 Sep 2003
Posts: 21708

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PostPosted: Fri Jun 04, 2010 2:24 pm     Reply with quote
First read Newguy's tutorial on timers:
http://www.ccsinfo.com/forum/viewtopic.php?t=22467

Then read this tutorial on Timer1:
http://www.microcontrollerboard.com/pic-timer1-tutorial.html

If you still have questions, then ask.


Microchip -- Timer0 Tutorial
http://ww1.microchip.com/downloads/en/DeviceDoc/51682A.pdf

Microchip -- Timer0 Tutorial (Part 2)
http://ww1.microchip.com/downloads/en/DeviceDoc/51702A.pdf
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