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Microcontrollers Questions Set 16:

Quiz Mode

Which of the following instructions is invalid?

PUSH 0E0H

POP 2

PUSH 3

PUSH A

Solution:

A memory chip of 512K has 8 data pins. What is the number of address pins?

Solution:

The PCON register consists of

power mode bit

power idle bit

power ideal bit

power down bit and idle bit

Solution:

Which bit of the TCON register i 8051 microcontroller, that whether the timers will work as timers or counters?

1, 3

2, 4

5, 6

2, 6

Solution:

What is ISR in 8051 microcontroller ?

Immediate service register

Indirect sum register

interrupt service routine

intermediate service routine

Solution:

What will be the final status of the carry flag in the following code ? MOV A, # 39H MOV B, # 75H SUBB A, B

CY =0

CY = 1

CY flag can't be determined.

none

Solution:

The Program Counter is a 16- or 32-bit register which contains the address of the next instruction to be executed (in an 8051 microcontroller).

Stack Pointer

Program Counter

Carry Flag

Special Function

Solution:

Which of the following statements is/are true about the 'SWAP' instruction?

It swaps the lower nibble with the higher nibble

It works on all 8-bit registers

It works only on the accumulator

It works on both 2 and 3

Solution:

In which type of the following, instructions will be transferred at a faster rate ?

microprocessor

microcontroller

both will have equal timing.

none of the above is true

Solution:

Which of the following statements about 8051 ports is not true?

8051 has 4 ports in total and each has 8 bits.

Upon RESET, all ports are configured as input ports.

For ports to be used as both input and output, a 10K ohm pull-up resistor is required to be connected externally for all ports.

Port 3 can also be used for serial communication.

Microcontrollers Questions Set 16:

Which of the following instructions is invalid?

Solution:

A memory chip of 512K has 8 data pins. What is the number of address pins?

Solution:

The PCON register consists of

Solution:

Which bit of the TCON register i 8051 microcontroller, that whether the timers will work as timers or counters?

Solution:

What is ISR in 8051 microcontroller ?

Solution:

What will be the final status of the carry flag in the following code ? MOV A, # 39H MOV B, # 75H SUBB A, B

Solution:

The Program Counter is a 16- or 32-bit register which contains the address of the next instruction to be executed (in an 8051 microcontroller).

Solution:

Which of the following statements is/are true about the 'SWAP' instruction?

Solution:

In which type of the following, instructions will be transferred at a faster rate ?

Solution:

Which of the following statements about 8051 ports is not true?

Solution:

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