MICROPROCESSOR AND MICROCONTROLLER

INTRODUCTION TO MICROPEOCESSOR

MODEL OF MICROPROCESSOR

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

In which mode, the CPU periodically reads an internal flag of 8279 to check whether any key is pressed or not with key pressure?

A	Interrupt mode
B	Polled mode
C	Decoded Mode
D	Encoded Mode

Explanation:

Detailed explanation-1: -In the Polled mode, the CPU periodically reads an internal flag of 8279 to check whether any key is pressed or not with key pressure.

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: -Explanation: The scanned keyboard special error mode is programmed using end interrupt/error mode set command.

Detailed explanation-4: -The Intel 8279 is a keyboard and display controller developed for interfacing to Intel 8085, 8086 and 8088 microprocessors. The industrial version of ID8279 was available for USD $30.70 in quantities of 100. Its important features are: Simultaneous keyboard and display operations.

There is 1 question to complete.