> Jinx-
> Why aren't you using the hardware PWM?
> David

I might be wrong, probably am as it doesn't sound right,
but from what I can gather from DS33023 (Mid-range
manual) PWM does not appear to be part of the interrupt
system in the way that TMR0 is. However, I should say
that I was in the middle of nutting out PWM for something
else and got side-tracked with this voltage thing, so chances
are I didn't get all the pieces together yet. If the PWM module
can indeed be used as a switch-mode driver under interrupt
then it's the sensible way to go

Specifically, is it always necessary to poll TMR2IF (as is the
case with the TRMT flag in the USART module) in software ?

If so, then I'd rather stick with TMR0 IRQs for this application

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