AVR timer are most reliable, fastest and precise timer. It is accurate to the resolution of microseconds. AVR is abbreviated as AVR (Advanced Virtual Risc) microcontroller. It commonly has a resolution of 8 (or) 16 bits. Use our online Atmel AVR timer calculator to find the microcontroller timer. Enter the system clock frequency, total time ticks and select the timer resolution, prescaler and total time ticks or any other unit and hit enter to get real time, frequency and overflow count.