It is possible to configure them as input or output by setting a particular register value through programming. This IC comes in 3 different packages, but we are using the popular 28-Pin PDIP package ...

In this case it is required to make two more connections (from Pin 2 (RxD) and Pin 3 (TxD) of the Atmega8 IC) in the breadboard. 10-pin ISP connection pinout is shown below. Kudos! Now the USBasp ...