8255 PIO Integration

8255 is an interface integration that provides data exchange/exchange with I/O devices in systems with microprocessor and microcontroller. They are produced in DIP-40, CLCC, PLCC structures.

It has 24 I/O pins. Basically, it is an interface integration that can be divided into 3 groups and programmed. It has eight-bit bidirectional data transmission/receiving ports, A Prot, B Port, C Port.

The 8255 can work in three different modes, MODE0, MODE1, MODE2.

8255 PIO can be programmed with A0, A1 and data inputs.

An example of MODE0 operation is shown in the picture.