Hi What timer/counter did arduino core libraries used ? for example i think timer 0 used for millies() or timer3 used for analogWrite. Are there any document to explain what register/interrupt/timer... arduino IDE used? My arduino is atmeg 2560. Thanks

[image] arduser20: is it possible to deactivate the using of timer0 by millis() and release it? you can mess with timer0 but it will impact arduino "time management" and of course the ISR(TIMER0_OVF_vect) is defined in the Arduino wiring.c file that is part of the compile environment.

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arduser20 September 7, 2021, 2:33pm 3

Hi, Jack
Thank for your help.
please note the reference if existed.
is it possible to deactivate the using of timer0 by millis() and release it?

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