Interrupt and Stack of 8051 Questions

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11.

The timer generates an interrupt, if the count value reaches to

A

00FFH

B

FF00H

C

0FFFH

D

FFFFH

Correct Answer: D

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12.

The external interrupt that has the lowest priority among the following is

A

TF0

B

TF1

C

IE1

D

NONE

Correct Answer: C

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13.

Among the five interrupts generated by 8051, the lowest priority is given to the interrupt

A

IE0

B

TF1

C

TF0

D

RI

Correct Answer: D

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14.

Among the five interrupts generated by 8051, the highest priority is given to the interrupt

A

IE0

B

TF1

C

TF0

D

IE1

Correct Answer: A

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15.

All the interrupts are enabled using a special function register called

A

interrupt priority register

B

interrupt register

C

interrupt function register

D

interrupt enable register

Correct Answer: D

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16.

The number of bytes stored on the stack during one operation of PUSH or POP is

A

1

B

2

C

3

D

4

Correct Answer: A

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17.

The step involved in PUSH operation is

A

increment stack by 2 and store 8-bit content to address pointed to by SP

B

decrement stack by 1 and store 16-bit content to address pointed to by SP

C

increment stack by 1 and store 8-bit content to address pointed to by SP

D

store 8-bit content to address pointed to by SP and then increment stack by 1

Correct Answer: C

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18.

The step involved in POP operation is

A

decrement stack by 2 and store 8-bit content to address pointed to by SP

B

store 16-bit content to address pointed to by SP and decrement stack by 1

C

decrement stack by 1 and store content of top of stack to address pointed to by SP

D

store content of top of stack to address pointed to by SP and then decrement stack by 1

Correct Answer: D

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19.

The 8051 stack is

A

auto-decrement during PUSH operations

B

auto-increment during POP operations

C

auto-decrement during POP operations

D

auto-increment during PUSH operations

Correct Answer: D

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20.

After reset, the stack pointer(SP) is initialized to the address of

A

internal ROM

B

internal RAM

C

external ROM

D

external RAM

Correct Answer: B

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