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📝 Initialization Command Words(ICWs) of 8259

📖 From An Introduction To Microprocessor 8085 • 11. Programmable Interrupt Controller: 8259 • 28 questions available

Practice MCQs for Initialization Command Words(ICWs) of 8259. 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. Which pin provides the clock input for counter 0?

🔹 A. Pin 9

🔹 B. Pin 10

🔹 C. Pin 11

🔹 D. Pin 12

💡 Difficulty: easy | ✅ Correct: A

Q2. Which pins are used for the address selection lines A0 and A1 on the 8253?

🔹 A. Pins 19 and 20

🔹 B. Pins 21 and 22

🔹 C. Pins 23 and 24

🔹 D. Pins 9 and 10

💡 Difficulty: medium | ✅ Correct: A

Q3. What happens if the clock inputs (CLK n) are not connected to a valid clock source?

🔹 A. The corresponding counter will never increment

🔹 B. The counter will count at the maximum speed

🔹 C. The chip will generate an internal clock automatically

🔹 D. The counter will reset to zero continuously

💡 Difficulty: hard | ✅ Correct: A

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🔗 Related Topics

📝 Programmable Interrupt Controller 8259 📝 Block Diagram of 8259 📝 Interfacing of 8259A with 8085A 📝 Vectoring Data Formats for 8259 📝 Initialization of 8259

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