>If the prescaler is used, never to do any writes to TMR0 if you wish to
>preserve the accuracy of continuous timing(I'm thinking propeller clock
>here, of course), just let the timer free run and keep track of your count
>elsewhere.
>
>If you are not using the prescaler, use the add-to-TMR0 method(which is
>when you'd most likely need it anyway, since you'd certainly miss some
>counts, and not a predictable number of them, since interrupt response time
>varies)?

Bob,

I prefer to do something like the following:


MainLoop

        movf    TriggerPoint,W
        xorwf   TMR0,W
        btfss   Z
        goto    NoMatch
Match
        ... process the timer match condition
        movlw   TimerIncrement
        addwf   TriggerPoint,F
        goto    MeetAgain
NoMatch
        ... do whatever if they don't match
MeetAgain
        ... whatever


Hope that helps a little.

Andy

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Andy Kunz - Montana Design - 409 S 6th St - Phillipsburg, NJ 08865
          Hardware & Software for Industry & R/C Hobbies
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