This video is about8255 ppi pin diagram,8255 programmable. Suresh bojja department of ece 8255 ppi programmable peripheral interface open box education. What is 8255 programmable peripheral interface ppi. Programmable peripheral interface the 8255a is a general purpose programmable io device designed for use with intel microprocessors. Architecture, pin diagram, operational modes and control word format. I have interfaced 64k sram and 8255 ppi to 8051rd2 for scanning matrix keyboard. Ppi 8255 is a general purpose programmable io device designed to interface the cpu with its outside world such as adc, dac, keyboard etc. Memory organisation in computer architecture difference between sram and dram.
It consists of three 8bit bidirectional io ports 24io lines that can be configured to meet different system io needs. Intel 8255 ppi working mechanism programmable peripheral interface lecture. Microprocessor 8255 programmable peripheral interface. Programmable peripheral interface 8255 geeksforgeeks. Ppi 8255 is a general purpose programmable io device designed to interface the cpu with its. Architecture of 8255 ppi in a larger vlsi chip as a sub function. Interface ppi 8255 8255 is a general purpose programmable device used for data transfer between processor and io devices. The 8255a programmable peripheral interface ppi implements a generalpurpose io interface to connect peripheral. The following figure shows the architecture of 8255a. Write a program to initialize 8255 in the configuration below.
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