Datasheet: Understanding the AVR Timer/Counter

The control register of the timer/counter is TCCR1A and TCCR1B since the register is 16-bit, two 8-bit register designations are made. Each bit of the register is like a switch to turn on or off to control some aspect of the timer/counter. TCCR1A has these switches: COM1A1, COM1A0, COM1B1, COM1B0, FOC1A, FOC1B, WGM11, WGM10. To start the times, we will use the Clock Select CS12, CS11 and CS10. These control the prescaling of the clock source (i.e. how many actual clock ticks to ignore when counting). Setting only CS10 to 1 or high, this will set the timer/count to count with the clock source with no prescaling.