9
PERIPHERAL INTERFACING
This chapter describes interfacing characteristics of a microcomputer with typical peripheral devices such as a hexadecimal keyboard, display, DMA controller, printer, CRT (Cathode Ray tube) terminal, and coprocessor.
9.1 Keyboard Interface
9.1.1 Basics of Keyboard and Display Interface to a Microprocessor
A common method of entering programs into a microcomputer is via a keyboard. A popular way of displaying results by the microcomputer is by using seven segment displays. The main functions to be performed for interfacing a keyboard are
- 1. Sense a key actuation.
- 2. Debounce the key.
- 3. Decode the key.
Let us now elaborate on the keyboard interfacing concepts. A keyboard is arranged in rows and columns.
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