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📝 8085 Microprocessor Based LED Dial Clock

📖 From An Introduction To Microprocessor 8085 • 15. Applications of Microprocessor • 31 questions available

Practice MCQs for 8085 Microprocessor Based LED Dial Clock. 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 hexadecimal address of the monitor program used to clear the LED display on the Vinytics kit?

🔹 A. 0347 H

🔹 B. 05D0 H

🔹 C. 2050 H

🔹 D. 2055 H

💡 Difficulty: easy | ✅ Correct: A

Q2. How does using six FNDs (four for address, two for data) simplify the representation of time compared to using a single 8‑digit display?

🔹 A. It reduces wiring complexity

🔹 B. It allows separate control of hour/minute and second fields

🔹 C. It enables multiplexing at higher speed

🔹 D. It provides redundancy

💡 Difficulty: medium | ✅ Correct: B

Q3. Suppose the microprocessor's internal timer overflows after 65536 cycles, and each cycle is 1 µs. Design a method to generate a one‑second interrupt using this timer, and explain how the clock routine would use this interrupt to update the display.

🔹 A. Configure the timer to generate an interrupt every 65536 µs, then count 15 such interrupts to make one second

🔹 B. Set the timer in mode 2 to overflow after 256 µs and count 3906 overflows

🔹 C. Program the timer for mode 1, load 0x3C00 to achieve 1 s directly

🔹 D. Use external crystal to generate 1 s interrupt directly

💡 Difficulty: hard | ✅ Correct: B

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