The timer subsytem can be used for the following functions:

• Periodic interrupts (Timer Overflow Interrupt or Real Time Interrupt
• Determining the time difference between two events (Input Capture)
• Making event happen at a regular rate (generating a square wave of a particular frequency) Output Compare
• Generating a Pulse Width Modulated signal using Output Compare
  • Can use a single Output Compare function - requires two interrupts per PWM period
  • Can use Output Compare function OC0 - OC6 together with OC7 - no interrupts required, but need to adjust TCNT rollover time to length of PWM period. Can configure up to 7 PWM channels, but all PWM channels will have same frequency.