This example program shows how to configure timer/counter 0 as a 16-bit counter. Each time port 3.4 goes low, the 16-bit counter is incremented by 1. To test this program... 1. Start the debugger. 2. View the Toolbox window. 3. View the Serial window. 4. Run the program. 5. Click the 'Toggle Port 3.4' button in the toolbox. You will see the value of the counter increase each time you click on the 'Toggle' button.