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Welcome to the 8051 Microcontroller MCQs Page

Dive deep into the fascinating world of 8051 Microcontroller with our comprehensive set of Multiple-Choice Questions (MCQs). This page is dedicated to exploring the fundamental concepts and intricacies of 8051 Microcontroller, a crucial aspect of Computer Architecture. In this section, you will encounter a diverse range of MCQs that cover various aspects of 8051 Microcontroller, from the basic principles to advanced topics. Each question is thoughtfully crafted to challenge your knowledge and deepen your understanding of this critical subcategory within Computer Architecture.

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Check out the MCQs below to embark on an enriching journey through 8051 Microcontroller. Test your knowledge, expand your horizons, and solidify your grasp on this vital area of Computer Architecture.

Note: Each MCQ comes with multiple answer choices. Select the most appropriate option and test your understanding of 8051 Microcontroller. You can click on an option to test your knowledge before viewing the solution for a MCQ. Happy learning!

8051 Microcontroller MCQs | Page 5 of 14

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Q41.
What is the clock source for the timers?

a.

some external crystal applied to the micro-controller for executing the timer

b.

from the crystal applied to the micro-controller

c.

through the software

d.

through programming

Discuss
Answer: (b).from the crystal applied to the micro-controller
Q42.
What is the frequency of the clock that is being used as the clock source for the timer?

a.

some externally applied frequency f’

b.

controller’s crystal frequency f

c.

controller’s crystal frequency /12

d.

externally applied frequency/12

Discuss
Answer: (c).controller’s crystal frequency /12
Q43.
What is the function of the TMOD register?

a.

TMOD register is used to set different timer’s or counter’s to their appropriate modes

b.

TMOD register is used to load the count of the timer.

c.

Is the destination or the final register where the result is obtained after the operation of the timer

d.

Is used to interrupt the timer

Discuss
Answer: (a).TMOD register is used to set different timer’s or counter’s to their appropriate modes
Q44.
What is the maximum delay that can be generated with the crystal frequency of 22MHz?

a.

2978.9 sec

b.

0.011 msec

c.

11.63 sec

d.

2.97 msec

Discuss
Answer: (d).2.97 msec
Q45.
Auto reload mode is allowed in which mode of the timer?

a.

Mode 0

b.

Mode 1

c.

Mode 2

d.

Mode 3

Discuss
Answer: (c).Mode 2
Q46.
Find out the roll over value for the timer in Mode 0, Mode 1 and Mode 2?

a.

00FFH,0FFFH,FFFFH

b.

1FFFH,0FFFH,FFFFH

c.

1FFFH,FFFFH,00FFH

d.

1FFFH,00FFH,FFFFH

Discuss
Answer: (c).1FFFH,FFFFH,00FFH
Q47.
What steps are followed when we need to turn on any timer?

a.

load the count, start the timer, keep monitoring it, stop the timer

b.

load the TMOD register, load the count, start the timer, keep monitoring it, stop the timer

c.

load the TMOD register, start the timer,load the count, keep monitoring it, stop the timer

d.

none of the mentioned

Discuss
Answer: (b).load the TMOD register, load the count, start the timer, keep monitoring it, stop the timer
Q48.
If Timer 0 is to be used as a counter, then at what particular pin clock pulse need to be applied?

a.

P3.3

b.

P3.4

c.

P3.5

d.

P3.6

Discuss
Answer: (b).P3.4
Q49.
In the instruction “MOV TH1,#-3”, what is the value that is being loaded in the TH1 register ?

a.

0xFCH

b.

0xFBH

c.

0xFDH

d.

0xFEH

Discuss
Answer: (a).0xFCH
Q50.
TF1, TR1, TF0, TR0 bits are of which register?

a.

TMOD

b.

SCON

c.

TCON

d.

SMOD

Discuss
Answer: (c).TCON
Page 5 of 14

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