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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 12 of 13

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Q111.
The transmission unit does not require assistance from processor if once a byte for transmission is written to

a.

SCON register

b.

SBUF register

c.

SFR address

d.

Any of the mentioned

Discuss
Answer: (b).SBUF register
Q112.
The common unit shared by the receiver unit and transmission unit of serial communication unit is

a.

SCON(Serial Port Control) Register

b.

SBUF(Serial Buffer) register

c.

8-bit serial data interface

d.

All of the mentioned

Discuss
Answer: (d).All of the mentioned
Q113.
During serial reception, the buffer that receives serial bits and converts to a byte is

a.

receive buffer 0

b.

receive buffer 1

c.

receive buffer 2

d.

None of the mentioned

Discuss
Answer: (b).receive buffer 1
Q114.
If SM0=1, SM1=0, then the transceiver selected is

a.

8-bit synchronous

b.

9-bit synchronous

c.

8-bit asynchronous

d.

9-bit asynchronous

Discuss
Answer: (d).9-bit asynchronous
Q115.
If the microcontroller is expected to communicate in a multiprocessor system, then the required condition is

a.

SM0 is set

b.

SM1 is set

c.

SM2 is set

d.

REN is set

Discuss
Answer: (c).SM2 is set
Q116.
In mode 2, the baud rate depends only on

a.

SMOD bit

b.

SCON bit

c.

Oscillator clock frequency

d.

SMOD bit and oscillator clock frequency

Discuss
Answer: (d).SMOD bit and oscillator clock frequency
Q117.
The mode that offers the most secured parity enabled data communication at lower baud rates is

a.

mode 2

b.

mode 1

c.

mode 0

d.

all of the mentioned

Discuss
Answer: (a).mode 2
Q118.
The power control register is

a.

used for power saving during idle state

b.

used for eventual power off to 8051 chip

c.

non-bit addressable register

d.

all of the mentioned

Discuss
Answer: (d).all of the mentioned
Q119.
The state of signals in idle mode is

a.

ALE is high

b.

PSEN is high

c.

PSEN(active low) is high

d.

ALE and PSEN(active low) are high

Discuss
Answer: (d).ALE and PSEN(active low) are high
Q120.
To come out of idle mode, the external interrupt that is enabled is

a.

SI(serial)

b.

INT0

c.

INT1

d.

All of the mentioned

Discuss
Answer: (d).All of the mentioned
Page 12 of 13

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