Ok so I took another look at it..

Timer 1 is the only interrupt in use.
In the interrupt, I increment a variable, which I check to generate a
signal (4 pulses @ a particular interval, and toggle another pin every 12
pulses).

All that seems to work, except that the variable is seeming to skip counts
occasionally. I'm not so concerned about jitter at this point.

I went so far as turning the timer off, resetting the int flag, writing the
counter with my count setting, and clearing the flag again before turning
the timer back on at the end of the interrupt. I'm baffled.

It should not skip a count on the variable in any case, especially with the
timer being off to write it. No rmw port issues, I'm writing to latb to
toggle pins.

I'll see about getting my laptop on the internet to post a code section of
the interrupt. I've checked the errata and the data sheet.. nothing
relevant. It also does it if I use a different timer. Simulates fine
however but that's not actual hardware.

Befuzzled,
Andrew
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