8255 ppi architectural software

This video is about8255 ppi pin diagram,8255 programmable. We can program it according to the given condition. Stbbar input is connected to external peripherals strobe output i. On resetting the system all port pins of 8255 go to high impedence state. Memory organisation in computer architecture difference between sram and dram. Suresh bojja department of ece 8255 ppi programmable peripheral interface open box education. The intels 8255 is designed for use with intels 8bit, 16bit and higher capability microprocessors. This is economical, functional, flexible but is a little complex and general purpose io device that can be used with almost any microprocessor. Ppi 8255 is a general purpose programmable io device designed to interface the cpu with its. Keyboard scanning using 8255 keil forum software tools arm.

It consists of three 8bit bidirectional io ports 24io lines that can be configured to meet different system io needs. Programmable peripheral interface the 8255a is a general purpose programmable io device designed for use with intel microprocessors. Its function is that of a general purposes io component to interface peripheral equipment to the microcomputer system bush. Write a program to initialize 8255 in the configuration below. Architecture, pin diagram, operational modes and control word format. Intel 8255 ppi working mechanism programmable peripheral interface lecture. Programmable peripheral interface 8255 geeksforgeeks. Ppi 8255 is a general purpose programmable io device designed to interface the cpu with its outside world such as adc, dac, keyboard etc. 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. Architecture of 8255 ppi in a larger vlsi chip as a sub function. The functional configuration of the 8255a is programmed by the systems software so that normally no. Microprocessor 8255 programmable peripheral interface. The following figure shows the architecture of 8255a. It can be used to transfer data under various condition from simple inputoutput to interrupt inputoutput.