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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 3 of 13

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Q21.
The 8259-A is a _________.

a.

piority Interrupt Controller

b.

priority Resolver

c.

interrupt Request Registry

d.

control logic

Discuss
Answer: (a).piority Interrupt Controller
Q22.
______ is used to transfer data between microprocessor and I/O process.

a.

8255A

b.

8279

c.

8254A

d.

8237A

Discuss
Answer: (a).8255A
Q23.
The registers that contain the status information is

a.

control registers

b.

instruction registers

c.

program status word

d.

all of the mentioned

Discuss
Answer: (c).program status word
Q24.
Which of the following register can be addressed as a byte?

a.

P1

b.

SCON

c.

TMOD

d.

TCON

Discuss
Answer: (c).TMOD
Q25.
Which of the following is bit-addressable register?

a.

SBUF

b.

PCON

c.

TMOD

d.

SCON

Discuss
Answer: (d).SCON
Q26.
The higher and lower bytes of a 16-bit register DPTR are represented respectively as

a.

LDPTR and HDPTR

b.

DPTRL and DPTRH

c.

DPH and DPL

d.

HDP and LDP

Discuss
Answer: (c).DPH and DPL
Q27.
The register that is used for accessing external data memory is

a.

DPH

b.

DPL

c.

DPTR

d.

none of the mentioned

Discuss
Answer: (c).DPTR
Q28.
Among the four groups of register banks, the number of groups that can be accessed at a time is

a.

1

b.

2

c.

3

d.

all the four

Discuss
Answer: (a).1
Q29.
The number of 8-bit registers that a register bank contain is

a.

2

b.

4

c.

6

d.

8

Discuss
Answer: (d).8
Q30.
If RS1=1, RS0=0, then the register bank selected is

a.

register bank 0

b.

register bank 1

c.

register bank 2

d.

register bank 3

Discuss
Answer: (c).register bank 2
Page 3 of 13

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