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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 9 of 14

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Q81.
Which of the following steps detects the key in a 4*4 keyboard matrix about the key that is being pressed?

a.

masking of bits

b.

ensuring that initially all keys are open

c.

checking that whether the key is actually pressed or not

d.

all of the mentioned

Discuss
Answer: (d).all of the mentioned
Q82.
What is described by this command: CJNE A,#00001111b, ROW1

a.

it masks the bit and then jump to the label where ROW1 is written

b.

it makes the value of the accumulator 0FH and then jumps at the address where ROW1 label is written

c.

it compares the value of the accumulator with 0FH and jumps to the location where ROW1 label is there, if the value becomes equal

d.

it compares the value of the accumulator with 0FH and jumps to the location where ROW1 label is there, if the value is not equal

Discuss
Answer: (d).it compares the value of the accumulator with 0FH and jumps to the location where ROW1 label is there, if the value is not equal
Q83.
To detect that in which column, the key is placed?

a.

we can mask the bits and then check it

b.

we can rotate the bits and then check that particular bit which is set or reset(according to the particular condition)

c.

none of the mentioned

d.

both of the mentioned

Discuss
Answer: (d).both of the mentioned
Q84.
In reading the columns of a matrix, if no key is pressed we should get all in binary notation

a.

0

b.

1

c.

F

d.

7

Discuss
Answer: (b).1
Q85.
If we need to operate a key of a keyboard in an interrupt mode, then it will generate what kind of interrupt?

a.

ES

b.

EX0/EX1

c.

T0/T1

d.

RESET

Discuss
Answer: (b).EX0/EX1
Q86.
To identify that which key is being pressed, we need to:

a.

ground all the pins of the port at a time.

b.

ground pins of the port one at a time

c.

connect all the pins of the port to the main supply at a time.

d.

none of the mentioned

Discuss
Answer: (b).ground pins of the port one at a time
Q87.
Key press detection and Key identification are:

a.

the same processes

b.

two different works done in Keyboard Interfacing

c.

none of the mentioned

d.

any of the mentioned

Discuss
Answer: (b).two different works done in Keyboard Interfacing
Q88.
Why two pins for ground are available in ADC0804?

a.

for controlling the ADCON0 and ADCON1 register of the controller

b.

for controlling the analog and the digital pins of the controller

c.

for both parts of the chip respectively

d.

none of the mentioned

Discuss
Answer: (b).for controlling the analog and the digital pins of the controller
Q89.
When is the function of the WR pin?

a.

its active high input used to inform ADC0804, about the end of conversion

b.

its active low input used to inform ADC0804, about the end of conversion

c.

its active low input used to inform ADC0804, about the start of conversion

d.

its active high input used to inform ADC0804, about the start of conversion

Discuss
Answer: (c).its active low input used to inform ADC0804, about the start of conversion
Q90.
State which of the following statements are false?

a.

CLK IN pin is used to tell about the conversion time

b.

INTR pin tells about the end of the conversion

c.

ADC0804 IC is an 8 bit parallel ADC in the family of the ADC0800 series

d.

None of the mentioned

Discuss
Answer: (d).None of the mentioned
Page 9 of 14

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