Programmable Peripheral Interface

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Presentation transcript:

Programmable Peripheral Interface 8255 Programmable Peripheral Interface

Pin details

The internal block diagram of 8255

Port Address

I/O port address Data bus D[7:0] 8086 A0 A1 RD WR RESET CS Control port PA[7:0] PB[7:0] PC[7:0] A7 A6 A5 A4 A3 A2 IO/M A1 A0 Port 0 0 0 1 1 1 PA PB PC Control

Different modes Mode 0: Simple Input or Output Ports A, B, and C can be individually programmed as input or output ports Port C is divided into two 4-bit ports which are independent from each other Mode 1: Input /Output Control Signals Ports A and B are programmed as input or output ports Port C is used for handshaking Mode 2: Bidirectional Data transfer Port A is programmed to be bi-directional Port C is for handshaking Port B can be either input or output in mode 0 or mode 1

Bit set reset Mode

Control word format for I/O mode