8255 ppi architectural software

Architecture, pin diagram, operational modes and control word format. Design and simulation of 8255 programmable peripheral interface. I have interfaced 64k sram and 8255 ppi to 8051rd2 for scanning matrix keyboard. The 8255a is a programmable peripheral interface ppi device designed for use in intel microcomputer systems. Programmable peripheral interface 8255 geeksforgeeks. Stbbar input is connected to external peripherals strobe output i. It can be used to transfer data under various condition from simple inputoutput to interrupt inputoutput. The functional configuration of the 8255a is programmed by the systems software so that normally no. This is economical, functional, flexible but is a little complex and general purpose io device that can be used with almost any microprocessor. The 8255a programmable peripheral interface ppi implements a generalpurpose io interface to connect peripheral. Microprocessor 8255 programmable peripheral interface.

The intels 8255 is designed for use with intels 8bit, 16bit and higher capability microprocessors. A video lecture on the basics and control word formation of ppi 8255 ic created as a part of fdp on use of ict in education for online and blended learning conducted by. What is 8255 programmable peripheral interface ppi. Ppi 8255 is a general purpose programmable io device designed to interface the cpu with its. On resetting the system all port pins of 8255 go to high impedence state.

We can program it according to the given condition. Memory organisation in computer architecture difference between sram and dram. Ppi 8255 is a general purpose programmable io device designed to interface the cpu with its outside world such as adc, dac, keyboard etc. Programmable peripheral interface the 8255a is a general purpose programmable io device designed for use with intel microprocessors. The following figure shows the architecture of 8255a. Keyboard scanning using 8255 keil forum software tools arm. This video is about8255 ppi pin diagram,8255 programmable. Intel 8255 ppi working mechanism programmable peripheral interface lecture.