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The counting direction is always up (incrementing), and no counter clear is performed. The counter simply over- runs when it passes its maximum 8-bit value (MAX = 0xFF) and then restarts from the bottom (0x00).
In normal operation the Timer/Counter Overflow Flag (TOV0) will be set in the same timer clock cycle as the TCNT0 becomes zero when unlock atmega324pa microcontroller flash program. The TOV0 Flag in this case behaves like a ninth bit, except that it is only set, not cleared.
However, combined with the timer overflow interrupt that automatically clears the TOV0 Flag, the timer resolution can be increased by software. A new counter value can be written anytime.
The Timer/Counter is a synchronous design and the timer clock (clkT0) is therefore shown as a clock enable signal in the following figures. The figures include information on when Interrupt Flags are set in order to unlock atmega164v mcu flash program. Below Figure contains timing data for basic Timer/Counter operation. The figure shows the count sequence close to the MAX value.