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MCQ

To avoid loading during read operation, the device used is

latch

flipflop

buffer

tristate buffer

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Which of the following are known as Higher Address Bus?

A15 - A8

AD7 - AD0

READY

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The device that enables the microprocessor to read data from the external devices is

printer

joystick

display

reader

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In which type of communication, the interface gets a single byte of data from the microprocessor and sends it bit by bit to the other system serially and vice-a-versa?

Parallel Communication Interface

Serial Communication Interface

Both A and B

None of the above

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

Interrupt mode

Polled mode

Decoded Mode

Encoded Mode

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Which of the following is not true features of 8257?

It has three channels which can be used over three I/O devices.

Each channel has 16-bit address and 14-bit counter.

Each channel can transfer data up to 64kb.

Each channel can be programmed independently.

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Microprocessor Basics

Classification

Input Output interfacing

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Instruction Set of 8086 8088

Interrupt and Stack of 8051

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