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Computer Science Engineering (CSE) Exam  >  Computer Science Engineering (CSE) Tests  >  Test: Interfacing With 8255 - Computer Science Engineering (CSE) MCQ

Test: Interfacing With 8255 - Computer Science Engineering (CSE) MCQ


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5 Questions MCQ Test - Test: Interfacing With 8255

Test: Interfacing With 8255 for Computer Science Engineering (CSE) 2024 is part of Computer Science Engineering (CSE) preparation. The Test: Interfacing With 8255 questions and answers have been prepared according to the Computer Science Engineering (CSE) exam syllabus.The Test: Interfacing With 8255 MCQs are made for Computer Science Engineering (CSE) 2024 Exam. Find important definitions, questions, notes, meanings, examples, exercises, MCQs and online tests for Test: Interfacing With 8255 below.
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Test: Interfacing With 8255 - Question 1
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 What is the function of 8255 chip?

Detailed Solution for Test: Interfacing With 8255 - Question 1

 8255 is an IC that is used to increase the number of input/output ports of a micro controller. As its ports offer an advantage of increasing the number of ports for interfacing external devices.

Test: Interfacing With 8255 - Question 2
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Which pins of a micro controller are directly connected with 8255?

Detailed Solution for Test: Interfacing With 8255 - Question 2

RD, WR, D0-D7 all are directly connected to the 8051 for telling the chip about the control signals and also for transferring the data.

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Test: Interfacing With 8255 - Question 3
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 Find the control word for PA= out, PB= in, PCL=out, PCH=out (Mode0)?

Detailed Solution for Test: Interfacing With 8255 - Question 3

The value that is being loaded in the control word is 10000010b for PB as an input port ans all others as the output ports being operated in mode0.

Test: Interfacing With 8255 - Question 4
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Which pins are used to select the ports and the control register?
Detailed Solution for Test: Interfacing With 8255 - Question 4

CS, A0, A1 all are used to select the ports and the control register of 8255.

Test: Interfacing With 8255 - Question 5
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 What is the value of the control register when RESET button is set to zero?
Detailed Solution for Test: Interfacing With 8255 - Question 5

RESET button makes the value of the control register clear if an active high pulse is applied to it. So for clearing the control register RESET button should be set to 1

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