I'm having an issue with an occasional (250ms or so) glitch with timer 1
using interrupts on a 2550 with USB.

Basically the interrupt increments a counter and creates 4 pulses on one
output and one pulse every twelve on another.

Only issue is that every so often, either a random pulse is missing or are
closer together than should be.

I wouldn't think USB would have anything to do with it, as this is the only
interrupt enabled, and a high interrupt at that.

It's mostly correct, except that glitch, ~250 ms spread. Wdt is disabled.
Communicates the whole time properly over USB, so it's not like the
processor is locking up. No code modifies the counter outside of the
interrupt.

I'll post the code/LA traces if needed, just wondering if someone has run
in to something similar.

Thanks,
Andrew
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