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Q.

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

A

Mode 0

B

Mode 1

C

Mode 2

D

Mode 3

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MCQ

1.

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

Discussion

MCQ

2.

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

Discussion

MCQ

3.

Which port can be split into two parts?

A

PORT A

B

PORT B

C

PORT C

D

PORT D

Discussion

MCQ

4.

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

Discussion

MCQ

5.

8253/54 can be operated in _________ Modes?

A

3

B

4

C

5

D

6

Discussion

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