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
View Answer
Ans : C
Explanation: The 8255A is a general purpose programmable I/O device designed to transfer the data from I/O to interrupt I/O
2. How many ports 8255A has?
A. 2
B. 3
C. 4
D. 5
View Answer
Ans : B
Explanation: 8255A has three ports, i.e., PORT A, PORT B, and PORT C.
3. Which port can be split into two parts?
A. PORT A
B. PORT B
C. PORT C
D. PORT D
View Answer
Ans : C
Explanation: Port C can be split into two parts, i.e. PORT C lower (PC0-PC3) and PORT C upper (PC7-PC4) by the control word.
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
View Answer
Ans : D
Explanation: All of the above are Features of 8255A.
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
View Answer
Ans : B
Explanation: Read/Write Control Logic : This block is responsible for controlling the internal/external transfer of data/control/status word.
6. Which of the following uses N-MOS technology?
A. 8253
B. 8254
C. 8255
D. 8256
View Answer
Ans : A
Explanation: 8253 : It uses N-MOS technology.
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
View Answer
Ans : B
Explanation: Data Bus Buffer : It is a tri-state, bi-directional, 8-bit buffer, which is used to interface the 8253/54 to the system data bus.
8. 8253/54 can be operated in _________ Modes?
A. 3
B. 4
C. 5
D. 6
View Answer
Ans : D
Explanation: 8253/54 can be operated in 6 different modes
9. Which mode can be used as a mono stable multi-vibrator?
A. Mode 0
B. Mode 1
C. Mode 2
D. Mode 3
View Answer
Ans : B
Explanation: Mode 1 : Programmable One Shot can be used as a mono stable multi-vibrator.
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
View Answer
Ans : C
Explanation: Mode 5 : Hardware Triggered Mode generates a strobe in response to an externally generated signal.
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