> > incrementing untouched by s/w and you're reloading the upper
> > byte at a time when it can't be incrementing, then that contention
> > corruption shouldn't (can't ?) cause any problems
> 
> Not quite.  Think what happens if TMR1L is at about 0xff when

Well, er, I did say when TMR1H can't be incrementing. That implies
that you make sure the reload is not during a time when there's the
possibility of a TMR1L rollover. Which, as you say, would probably
be early in an ISR or whatever

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