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Welcome to the Microcontroller 8051 MCQs Page

Dive deep into the fascinating world of Microcontroller 8051 with our comprehensive set of Multiple-Choice Questions (MCQs). This page is dedicated to exploring the fundamental concepts and intricacies of Microcontroller 8051, a crucial aspect of Microprocessor. In this section, you will encounter a diverse range of MCQs that cover various aspects of Microcontroller 8051, 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 Microprocessor.

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

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

Microcontroller 8051 MCQs | Page 5 of 13

Q41.
The pulses at T0 or T1 pin are counted in
Discuss
Answer: (b).counter mode
Q42.
In timer mode, the oscillator clock is divided by a prescalar
Discuss
Answer: (d).(1/32)
Q43.
The serial port interrupt is generated if
Discuss
Answer: (c).Either RI or TI is set
Q44.
In serial port interrupt, after the control is transferred to the interrupt service routine, the flag that is cleared is
Discuss
Answer: (d).none of the mentioned
Q45.
The atleast number of machine cycles for which the external interrupts that are programmed level-sensitive should remain high is

a.

1

b.

2

c.

3

d.

0

Discuss
Answer: (b).2
Q46.
If the external interrupts are programmed edge sensitive, then they should remain high for atleast
Discuss
Answer: (c).1 machine cycle
Q47.
The timer generates an interrupt, if the count value reaches to
Discuss
Answer: (d).FFFFH
Q48.
The external interrupt that has the lowest priority among the following is
Discuss
Answer: (c).IE1
Q49.
Among the five interrupts generated by 8051, the lowest priority is given to the interrupt
Discuss
Answer: (d).RI
Q50.
Among the five interrupts generated by 8051, the highest priority is given to the interrupt
Discuss
Answer: (a).IE0
Page 5 of 13

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