Project: Dyno. Check it out, for criticism and advice

[GoForSmoke]

All they are saying is that if you disable interrupts (eg. by being in another ISR) for too long, then it might miss a tick. But since the timer fires every 1024 uS (roughly once a millisecond) you would have to disable interrupts for a long time for that to be a worry.

To miss a tick it's only got to be processing an IRQ during the 'tick'. But for 99.999% of use I don't think it's a problem. If you somehow got interrupts even partly synched to the millis though it might indicate a software problem.

IIRC micros() keep counting during IRQs.