Peripheral Interface Questions

MCQ bookmark_border

1.

The ______ is a general purpose programmable I/O device designed to transfer the data from I/O to interrupt I/O.

A

8285A

B

8241A

C

8255A

D

8251A

Correct Answer: C

Check Answer report_problem Report forum Discussion

MCQ bookmark_border

2.

How many ports 8255A has?

A

2

B

3

C

4

D

5

Correct Answer: B

Check Answer report_problem Report forum Discussion

MCQ bookmark_border

3.

 Which port can be split into two parts?

A

PORT A

B

PORT B

C

PORT C

D

PORT D

Correct Answer: C

Check Answer report_problem Report forum Discussion

MCQ bookmark_border

4.

Which of the following are Features of 8255A?

A

It consists of 3 8-bit IO ports i.e. PA, PB, and PC.

B

Address/data bus must be externally demux'd.

C

It is TTL compatible.

D

All of the above

Correct Answer: D

Check Answer report_problem Report forum Discussion

MCQ bookmark_border

5.

Which of the following is responsible for controlling the internal/external transfer of data/control/status word?

A

Data Bus Buffer

B

Read/Write Control Logic

C

CS

D

WR

Correct Answer: B

Check Answer report_problem Report forum Discussion

MCQ bookmark_border

6.

Which of the following uses N-MOS technology?

A

8253

B

8254

C

8255

D

8256

Correct Answer: A

Check Answer report_problem Report forum Discussion

MCQ bookmark_border

7.

It is a tri-state, bi-directional, 8-bit buffer, which is used to interface the 8253/54 to the system data bus.

A

Read/Write Logic

B

Data Bus Buffer

C

system data bus

D

System Buffer

Correct Answer: B

Check Answer report_problem Report forum Discussion

MCQ bookmark_border

8.

 8253/54 can be operated in _________ Modes?

A

3

B

4

C

5

D

6

Correct Answer: D

Check Answer report_problem Report forum Discussion

MCQ bookmark_border

9.

Which mode can be used as a mono stable multi-vibrator?

A

Mode 0

B

Mode 1

C

Mode 2

D

Mode 3

Correct Answer: B

Check Answer report_problem Report forum Discussion

MCQ bookmark_border

10.

Which mode generates a strobe in response to an externally generated signal?

A

Mode 3

B

Mode 4

C

Mode 5

D

Mode 6

Correct Answer: C

Check Answer report_problem Report forum Discussion