3.2.2 Naming convention

Although software can configure each individual pin, the AVR MCUs provides interfaces to configure 8 pins at the same time. A ``port'' is a group of 8 pins, and software can configure all 8 pins in a port in one operation.

It is conventional with AVR MCUs to refer to the ports as port A, port B and etc. The ATMega128 has port A to port G available, while some of the smaller MCUs only have one or two ports.