It is a programmable keyboard and display interfacing component that scans and encodes up to a 64-key keyboard and controls up to a 16-digit numerical display.

MICROCOMPUTER SYSTEM

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Question [CLICK ON ANY CHOICE TO KNOW THE RIGHT ANSWER]

A	8237
B	8253
C	8255
D	8279

Explanation:

Detailed explanation-1: -The scan lines are common for keyboard and display. The scan lines are used to form the rows of a matrix keyboard and also connected to digit drivers of a multiplexed display, to turn ON/OFF. CPU INTERFACE SECTION: The CPU interface section takes care of data transfer between 8279 and the processor.

Detailed explanation-2: -The four major sections of 8279 are keyboard, scan, display and CPU interface. Keyboard section: The keyboard section consists of eight return lines RL0 – RL7 that can be used to form the columns of a keyboard matrix. It has two additional input : shift and control/strobe.

Detailed explanation-3: -The 8279 is a programmable keyboard and display interfacing component that scans and en-codes up to a 64-key keyboard and controls up to a 16-digit numerical display.

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MICROPROCESSOR AND MICROCONTROLLER

INTRODUCTION TO MICROPEOCESSOR

MICROCOMPUTER SYSTEM