> -----Original Message-----
> From: Bob Ammerman [SMTP:RAMMERMAN@PRODIGY.NET]
> Sent: Thursday, February 22, 2001 12:22 PM
> To:   PICLIST@MITVMA.MIT.EDU
> Subject:      Re: [PIC] Timer Tribulations
>
> As I said before:
>
> Do _NOT_ preload TMR0.
>
> Instead ADD to TMR0.
>
> For a period of 250 cycles the correct value is:
>
> 256-250+2 == 8
>
> The +2 is needed because the timer doesn't update for two cycles when it
> is
> written to (by the ADD).
>
> I have done this. It WORKS!
>
> Bob Ammerman
> RAm Systems
> (contract development of high performance, high function, low-level
> software)
>
Bob is perfectly correct.  By adding a constant to the timer, you
effectively remove the only variable in the problem: the interrupt latency.

Mike

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