Timer0:
Timer0 is a 8bit timer.
In the Arduino world timer0 is been used for the timer functions, like delay(), millis() and micros(). If you change timer0 registers, this may influence the Arduino timer function. So you should know what you are doing.
Timer1:
Timer1 is a 16bit timer.
In the Arduino world the Servo library uses timer1 on Arduino Uno (timer5 on Arduino Mega).
Timer2:
Timer2 is a 8bit timer like timer0.
In the Arduino work the tone() function uses timer2.
Timer3, Timer4, Timer5:
Timer 3,4,5 are only available on Arduino Mega boards. These timers are all 16bit timers.
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