I'm using a 16C74 to do a project where I get the sanitized version of a
real world signal as the input to RB0 (external interrupt). Because this
signal can be noisy, I can receive several edges from one event. To filter
out the extraneous pulses, I decided to disable the external interrupt and
run timer0 for one cycle at maximum scale (gives me a 32msec window where I
can ignore edges). In the interrupt handler for timer0, I turn it off, and
make INTE=1 again. (I'm using timer1 and timer2 for other things already).

Now this setup works ... most of the time. Every once in a while (probably
15 - 20 seconds), I miss a timer0 interrupt. Which means that I never
reenable RB0, and miss a bunch of legitimate edges. My data collection
routine runs every 8 seconds so when it notices that no edges have been
detected since the last time, it reinitializes and I carry on. However, it
would be better if this didn't happen at all.

Has anybody else ran into this kind of thing? Any suggestions as to what I
could try? I could just allow all interrupts and filter them after the
fact, but I'd rather just not process the interrupt in the first place.

thx
rick