This document discusses various topics related to interfacing in computing systems. It covers I/O interfacing, memory interfacing, I/O mapped I/O, memory mapped I/O, the 8255 parallel communication interface including its pin diagram and operating modes, and analog to digital interfacing. The document is authored by Mr. B. Kannan and cites a reference book on microprocessors and microcontrollers.

1. I/O Interfacing
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2. Memory interfacing
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8. I/O Interfacing
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17. I/O Mapped I/O
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19. Memory Mapped I/O
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22. Parallel Communication interface 8255a
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25. PIN DIAGRAM OF 8255
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30. Modes of 8255
BSR Mode I/O Modes
Simple I/O
Input/output with
Handshake
Bidirectional I/O
data transfer
(iv) Operating Modes of 8255 PPI:
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37. Analog to Digital Interface
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Reference:
D.A.Godse, A.P.Godse, “Microprocessors & Microcontrollers”, technical publication, 2015.