The 8051 Microcontroller MCQs

Question 1

The internal RAM memory of the 8051 is:

Accepted Answer

128 bytes

Answer

32 bytes

Answer

64 bytes

Answer

256 bytes

Question 2

The 8051 has ________ 16-bit counter/timers.

Accepted Answer

2

Answer

1

Answer

3

Answer

4

Question 3

The 8051 can handle ________ interrupt sources.

Accepted Answer

5

Answer

3

Answer

4

Answer

6

Question 4

MOV A, @ R1 will:

Accepted Answer

copy the contents of memory whose address is in R1 to the accumulator

Answer

copy R1 to the accumulator

Answer

copy the accumulator to R1

Answer

copy the accumulator to the contents of memory whose address is in R1

Question 5

An alternate function of port pin P3.4 in the 8051 is:

Accepted Answer

Timer 0

Answer

Timer 1

Answer

interrupt 0

Answer

interrupt 1

Question 6

The I/O ports that are used as address and data for external memory are:

Accepted Answer

ports 0 and 2

Answer

ports 1 and 2

Answer

ports 1 and 3

Answer

ports 0 and 3

Question 7

Microcontrollers often have:

Accepted Answer

all of the above

Answer

CPUs

Answer

RAM

Answer

ROM

Question 8

The 8051 has ________ parallel I/O ports.

Accepted Answer

4

Answer

2

Answer

3

Answer

5

Question 9

The total external data memory that can be interfaced to the 8051 is:

Accepted Answer

64K

Answer

32K

Answer

128K

Answer

256K