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📝 8253 Interfacing and Programming

📖 From An Introduction To Microprocessor 8085 • 9. Programmable Interval Timer/Counter: 8253 • 27 questions available

Practice MCQs for 8253 Interfacing and Programming. Test your knowledge with carefully crafted questions across easy, medium, and hard difficulty levels.

🔄 Last updated: 2026-07-30

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📝 Sample Questions

Q1. What is the primary function of the 8253 chip in a microprocessor system?

🔹 A. Generate precise time delays and waveforms

🔹 B. Perform arithmetic operations

🔹 C. Store data in memory

🔹 D. Provide a regulated power supply

💡 Difficulty: easy | ✅ Correct: A

Q2. How does the gate input affect the counting process of an individual 8253 counter?

🔹 A. It enables counting when asserted

🔹 B. It resets the counter to zero

🔹 C. It selects binary versus BCD mode

🔹 D. It supplies power to the counter

💡 Difficulty: medium | ✅ Correct: A

Q3. What effect does setting the mode control word to Mode 3 (square‑wave generator) have on the output waveform?

🔹 A. Produces a continuous square wave with 50 % duty cycle

🔹 B. Generates a one‑shot pulse on the next clock edge

🔹 C. Counts upward instead of downwards

🔹 D. Resets the counter after each overflow

💡 Difficulty: hard | ✅ Correct: A

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🔗 Related Topics

📝 INTEL Programmable Interval Timer 8253 📝 Block Diagram of 8253 📝 Logics for Counters of 8253 📝 Control Word Format of 8253 📝 Programming of 8253 in Mode 0: Interrupt on Terminal Count

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