Ake Hedman wrote :

> The problem was me nulling TMR0L before TMR0H on one of the edges.
> 
> I still don't understand what the differens is but reversing 
> the order  resolves my problem. If anyone know why this is
> like this I'm very interested to learn why!?

You should write the *high* byte before the *low* byte.
See the data sheet for details (section 11.4, page 111).

(And read the *low* byte before the *high*, if reading...)

Jan-Erik.



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