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Microcontrollers Questions Set 35:

Quiz Mode

How much on-chip ROM does the 8051 microcontroller have?

128 bytes

4,000 bytes

2,042 bytes

8,048 bytes

Solution:

Which of the following 8051 programming instructions is invalid?

All of the above

ADD R2, A

ADD R1, R2

ADD R2, #12H

ADD 12H, A

Solution:

After executing the following assembly instructions:

`MOV A, #52H`

`SWAP A`

The content in register A is,

01010010

00100101

10100010

01001010

Solution:

Which is the concatenated register of the MC68HC11 microcontroller?

a) Register D

b) Register X

c) Instruction Pointer (IP)

d) Register DI

Solution:

When does the microcontroller enter power-down mode?

When the SMOD bit of PCON is set

When the GF1 bit of PCON is set

When the PD bit of PCON is set

When the GF2 bit of PCON is set

Solution:

#include<reg51.h>

void main()

{

P0 = 0X9A >> 3;

P1 = 0X9 << 4;

}

The output of the above code is,

P0 = 0X13, P1 = 0X90

P0 = 0X90, P1 = 0X13

P0 = 0X53, P1 = 0X90

P0 = 0X13, P1 = 0X09

Solution:

Which of the following statement(s) about the 8051 microcontroller is/are true?

Only statement 1 is true

Statements 1 and 2 are true

Only statement 3 is true

None of the statements 1, 2 and 3 are true

Solution:

The data address of a look-up table is found by adding the contents of which registers?

Accumulator and program counter

Accumulator and program counter or data pointer

Data register and program counter or accumulator

Data register and program counter or data pointer

Solution:

1. 8051 does not have on-chip ADC.

2. In 8051, values can be directly moved to registers R0-R7.

3. MOV SP, #21H is not a valid instruction as address location 20-2F is reserved for bit addressable RAM.

4. When 8051 is powered up, the program counter(PC) has value 0000H in it.

Select the correct statements.

1, 2, 3, 4

1, 4

2, 4

1, 2, 4

Solution:

Which of the following statements about the CJNE instruction is false?

The CJNE instruction compares two operands and jumps if they are equal

The destination operand can be in the accumulator or in one of the Rn registers

The actions of comparing and jumping are combined into a single CJNE instruction

It changes the CY flag to indicate if the destination operand is larger or smaller

Microcontrollers Questions Set 35:

How much on-chip ROM does the 8051 microcontroller have?

Solution:

Which of the following 8051 programming instructions is invalid?

Solution:

After executing the following assembly instructions:

`MOV A, #52H`

`SWAP A`

The content in register A is,

Solution:

Which is the concatenated register of the MC68HC11 microcontroller?

Solution:

When does the microcontroller enter power-down mode?

Solution:

#include<reg51.h>

void main()

{

P0 = 0X9A >> 3;

P1 = 0X9 << 4;

}

The output of the above code is,

Solution:

Which of the following statement(s) about the 8051 microcontroller is/are true?

Solution:

The data address of a look-up table is found by adding the contents of which registers?

Solution:

Solution:

Which of the following statements about the CJNE instruction is false?

Solution:

Related Question Sets:

Related Topics:

Microcontrollers Questions Set 35:

How much on-chip ROM does the 8051 microcontroller have?

Solution:

Which of the following 8051 programming instructions is invalid?

Solution:

After executing the following assembly instructions: MOV A, #52H SWAP A The content in register A is,

Solution:

Which is the concatenated register of the MC68HC11 microcontroller?

Solution:

When does the microcontroller enter power-down mode?

Solution:

#include<reg51.h> void main() { P0 = 0X9A >> 3; P1 = 0X9 << 4; } The output of the above code is,

Solution:

Which of the following statement(s) about the 8051 microcontroller is/are true?

Solution:

The data address of a look-up table is found by adding the contents of which registers?

Solution:

Solution:

Which of the following statements about the CJNE instruction is false?

Solution:

Related Question Sets:

Related Topics:

After executing the following assembly instructions:

`MOV A, #52H`

`SWAP A`

The content in register A is,

#include<reg51.h>

void main()

{

P0 = 0X9A >> 3;

P1 = 0X9 << 4;

}

The output of the above code is,