In a message dated 10/26/99 6:02:22 AM Eastern Daylight Time,
Mark.Langezaal@KLM.NL writes:

> But there is a simple yet elegant solution to make it jitter free.
>  Insert the following two instructions at the top of the interrupt routine:
>
>  ;
>  ;
>  ;
>          ORG    04H
>  ISR
>          BTFSC  TMR0,0   ; Interrupt occurred during branch?
>          GOTO   $+1      ; Waist one extra cycle
>
>
>  After this sequence the interrupt timing is jitter-free!
>
>  This works only for a free running (no prescaler) TMR0.
>  I have this knowledge from the excellent Application note AN654 (Software
>  PWM).
>
>  Brgs,
>  Mark Langezaal
>
    Or switch to Scenix!
Matt B