While these timers can be as accurate as a cheap digital ... [Karl] started his project with an ATMega168 and a 20 MHz crystal and the prescaler set at 256. This made the 78.125 interrupts per ...

Fortunately, we have the option to use a divider with our timer, called a prescaler. To do so we look in the datasheet on page 134 to see a chart outlining the clock select. It shows prescaler ...