References

  1. AVR130: Using the timers on tinyAVR and megaAVR devices
  2. AVR135: Using Timer Capture to Measure PWM Duty Cycle on tinyAVR and megaAVR devices
  3. AVR205: Frequency measurement made easy with Atmel tinyAVR and Atmel megaAVR
  4. AVR504: Migrating from ATtiny26 to ATtiny261/461/861