Introduction to AVR Digital Input/Output
Atmel AVR 8-bits microcontrollers provide pins to take in/output information form/to the outside world in the form of logic values. These pins are usually organised in groups of eight (8) and referred to as a port. The AVR use the alphabet to name these port, example PortA, PortB, etc. The figure below shows the pins of an AVR 8-bit microcontroller which has four (4) digital I/O ports: PortA, PortB, PortC and PortD. The pins of PortA are: PA0 – PA7.
