> Ok so I massively simplified the code to instead output the low two bits
>> of the counter variable and let it just run (while still reloading the
>> timer interval with the timer off for the duration of the interrupt). It
>> still hiccups (verified with a logic analyzer). ...
>
>
>  Appears as though it's every +/-8 ms, regardless of timer interval... An=
y
> significance there? I am running the timer at 1:1 prescale. 48mhz. Usb
> enabled and running but polling not interrupt. Wdt disabled (would be
> disconnecting from PC if it was resetting?)
>
--=20
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