AVR-Chat

Are you trying to modify a PIC program to operate on AVR?

Jim

On Mon, 2 Oct 2006 10:25:29 +1000
 "OWEN-A" <oldboot@bigpond.com> wrote:
> I have a situation where a counter used in an interrupt
> may rollover before
> a compare is reached, for example the timer is set to
> 0x26 within the
> interrupt then decremented by one every time the
> interrupt is entered until
> 0 is reached, then reset to 0x26 again.
> 
> PORTD PIN0 is set high somewhere within the count of 26
> down to 1  (or 0
> within the interrupt) and has to be set low after say
> 0x1A counts,  if the
> counter is read when PORTD PIN0 is set high and is on
> 0x0F the counter will
> rollover before the turnoff point is reached, this may or
> may not happen
> depending on when PORTD PIN0 is set.
> 
> I am not very proficient at assembly and any help would
> be appreciated I am
> modifying another person's program and the processor is a
> PIC16F877.
> 
>  
> 
> Thanking You,
> 
> Owen
> 
>  
> 
>  
> 
> 
> 
> [Non-text portions of this message have been removed]
> 

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