Jo Scherpenisse wrote:

> Thank you, but I didn't use sleep...
> And the T1sync bit HAS influence!!
> I've tested it twice.
> If zero, the timer did not run.

Jo,
whithout seeing the "whole picture", that is all
rellevent code where you initialize the timer and
other rellevant FSR's, this will never be anything
but guessing.

*my* best guess is that, since the TMR1 must be one
of the most used peripherials, and the 16F628 is one
of the most used PIC models, it *is* something else
in your code, not a hardware or documentation "bug".

Make the shortest reproducable *complete" code example
you can that shows what you are seeing and post it.
Then anyone can easily load it and check. Or (as *I*
think) just point out the error in the code :-)

Regards
Jan-Erik.

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