> turning the Timer off and on shouldn't TMR1IF_bit be TMR1IE_bit?

There are 3 bits

TMR1ON_OFF starts/stops the timer running

TMR1IE is one of the bits allowing the hardware to recognise TMR1
interrupts (there are others for timers and other various functions in
PEIE, PIEx, PIRx and INTCON)

TMR1IF is the interrupt bit, set automatically when TMR1 goes from
FFFF to 0000, whether interrupts are enabled or not (eg IF can be
polled by s/w)

If  TMR1ON_OFF =3D 0 then TMR1 is stopped and its current value
is frozen, regardless of the state of any interrupt bits

TMR1IE =3D 0 (or any relevant IE in the pathway) will stop interrupts
being recognised by the system but it's not the same as starting/stopping
the timer

Joe
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