You can as well load a count value in TCNT0 and start the timer from a specific count. If it does so, a Timer OverFlow Flag(TOV) is set. If the timer is turned on it ticks from 0 to 255 and overflows. The TCNT0 register hold the timer Count and it is incremented on every timer "tick". The operation of timer 0 is straight forward. It basically means it can count from 0 to 2^8 255. Let us start our exploration with timer 0. Pulse width Modulation(PWM) Generator: PWM is used in speed control of motors and various other applications.Ītmega32 has 3 timer units, timer 0, timer 1 and timer 2 respectively.External Counter: In this mode the unit is used to count events on a specific external pin on a MCU.In this mode it used generate precise delays. The oscillator frequency can be directly feed to the timer or it can be pre-scaled. Internal Timer: As an internal timer the unit, ticks on the oscillator frequency.Hence they come in very handy, and are primarily used for the following: They basically run independently of what task CPU is performing. Timers/counters are an independent unit inside a micro-controller.
Remember it is the same hardware unit inside the MCU that is used either as Timers or Counter. Timers/Counters are essential part of any modern MCU.
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