Microprocessor Peripheral Interface MCQ Questions

This section focuses on "Peripheral Interface" in Microprocessor. These Multiple Choice Questions (MCQ) should be practiced to improve the Microprocessor skills required for various interviews (campus interview, walk-in interview, company interview), placements, entrance exams and other competitive examinations.

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

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2. How many ports 8255A has?

A. 2
B. 3
C. 4
D. 5

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3. Which port can be split into two parts?

A. PORT A
B. PORT B
C. PORT C
D. PORT D

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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

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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

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6. Which of the following uses N-MOS technology?

A. 8253
B. 8254
C. 8255
D. 8256

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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

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8. 8253/54 can be operated in _________ Modes?

A. 3
B. 4
C. 5
D. 6

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9. 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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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

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