> Anyway, to stop this kind of comments, why not
> simply write them in the order recomened
> by the datahseet ? :-) :-)

As I said -

> > I've tried it both ways

Currently it's

bitdel   mov      0xfc,tmr0h
         mov      0x18,tmr0l

rolling over at 757us. And that's the way I started. Yes,
I am aware of re-load order (although I said I wasn't sure
about whether the timer was running or not, subconsciously
maybe I was, because that's how I wrote the code), and
particularly as I read the 4550's TMR0 section to check
afterwards

"Similarly, a write to the high byte of Timer0 must also
take place through the TMR0H Buffer register. The high
byte is updated with the contents of TMR0H when a
write occurs to TMR0L. This allows all 16 bits of Timer0
to be updated at once"

So I'm still stumped. But thanks for the input guys, really

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