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Timer1 Overflow

 
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Pilt1
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Timer1 Overflow
PostPosted: Thu May 18, 2006 4:10 pm     Reply with quote
Hi how can i check for timer 1 overflow?

This is how i did it on a PIC 18F using the microchip 18 compiler:


Code:


if(PIR1bits.TMR1IF) //If timer 1 has overflowed add 65536
  {
   PIR1bits.TMR1IF = 0;
   comp_count += 65536;
  }




IM now trying to do the same on a PIC 16f8777a using the CCS compiler

I realize i can do this by using the timer overflow interrupt but is there a way of directly accesing this varible like above?

Thanks

Pilt
newguy



Joined: 24 Jun 2004
Posts: 1909

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PostPosted: Thu May 18, 2006 4:18 pm     Reply with quote
Sure - just use a #bit declaration. You need to look in that PIC's datasheet for the exact location of that flag. I did the same thing for a 18F4680, and this is how I did it:

Code:
#bit tmr1_int_flag = 0xf9e.0


For the 18F4680, it is bit 0 of memory location 0xF9E. The location of the timer 1 interrupt flag will be different for your processor.

Your code would then be like this:

Code:
if(tmr1_int_flag) //If timer 1 has overflowed add 65536
  {
   tmr1_int_flag = 0;
   comp_count += 65536;
  }
PCM programmer



Joined: 06 Sep 2003
Posts: 21708

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PostPosted: Thu May 18, 2006 4:19 pm     Reply with quote
Quote:
but is there a way of directly accesing this varible like above?

This thread gives examples of how to declare TMR1IF as a bit variable:
http://www.ccsinfo.com/forum/viewtopic.php?t=17174&highlight=tmr1if
pilt1
Guest
PostPosted: Thu May 18, 2006 6:42 pm     Reply with quote
Thanks, thats just what i needed!

Cheers

Pilt
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