Matthew Twomey wrote:
> Or make sure your interrupt routine puts things back in place before
> it returns (always a good thing to do when possible)...

That's not OP's problem.  Part of the the interrupt routine's job is to
update a 4 byte value.  Reading this value obviously takes multiple cycles
in the forground routine.  He wants to make sure that all 4 bytes come from
the same value, not parts of 2 or more values.  The best way to guarantee
that is to shut off interrupts temporarily when grabbing all 4 bytes.


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