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Microcontrollers Questions Set 14:

Quiz Mode

How many types of data transfer instructions are there in 8051 microcontroller ?

Solution:

Which I/O port of 8051 does not have alternative or dual functions ?

Port 0

Port 1

Port 2

Port 3

Solution:

How many bits in a 16 bit address define the address of the page memory in 8051 microcontroller ?

Solution:

What is the physical address of the highest priority interrupt among the following?

0003H

000BH

0013H

001BH

Solution:

What is the status of the Carry (CY) and Auxiliary Carry (AC) flags after adding 9CH and 64H?

CY=0, AC=0

CY=0, AC=1

CY=1, AC=0

CY=1, AC=1

Solution:

Which of the following components is present in a microcontroller but not in a general-purpose microprocessor?

RAM

ROM

I/O ports

None of the above

All of the above

Solution:

Some data is transferred from a peripheral device in the microcontroller, it will be stored in which form ?

serial

Parallel

combination of serial and parallel

none

Solution:

If A = #25H and B = #65H, what will the contents of A and B after executing the instruction 'MUL AB'?

A = #99H; B = #0EH

A = #99H; B = #65H

A = #0EH; B = #99H

A = #25H; B = #99H

Solution:

Which of the following is true about the CJNE (Compare and Jump if Not Equal) instruction?

If destination < source then CY=1

If destination ≥ source then CY=0

If destination > source then CY=0

Both 1 and 2

Both 2 and 3

Solution:

If A=0000 0010 and R2=0000 0100, what will be the content of the accumulator and R2 after the execution of 'ADD A, R2'?

A=0000 0110 & R2=0000 0100

A=0000 0010 & R2=0000 0110

A=0000 0100 & R2=0000 0010

A=0000 0010 & R2=0000 0100

Microcontrollers Questions Set 14:

How many types of data transfer instructions are there in 8051 microcontroller ?

Solution:

Which I/O port of 8051 does not have alternative or dual functions ?

Solution:

How many bits in a 16 bit address define the address of the page memory in 8051 microcontroller ?

Solution:

What is the physical address of the highest priority interrupt among the following?

Solution:

What is the status of the Carry (CY) and Auxiliary Carry (AC) flags after adding 9CH and 64H?

Solution:

Which of the following components is present in a microcontroller but not in a general-purpose microprocessor?

Solution:

Some data is transferred from a peripheral device in the microcontroller, it will be stored in which form ?

Solution:

If A = #25H and B = #65H, what will the contents of A and B after executing the instruction 'MUL AB'?

Solution:

Which of the following is true about the CJNE (Compare and Jump if Not Equal) instruction?

Solution:

If A=0000 0010 and R2=0000 0100, what will be the content of the accumulator and R2 after the execution of 'ADD A, R2'?

Solution:

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