Programming and Result: Using the Timer/Counter to Toggle an LED every second

The Timer/Counter is used to count against a known clock frequency, the internal clock source for the AVR microcontroller. In the first part of the experiment, an LED, connected to PORTB and Pin 0 is toggled every time TCNT1 is counted to 10000 * 100 using another loop. This makes the LED toggle every second The TCCR1B Timer/Counter Control 16-bit Register B is used to turn on the CS10 (Clock Select) option of the control register to enable the timer for no prescaling.