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📝 Operation Command Words (OCWs) of 8259

📖 From An Introduction To Microprocessor 8085 • 11. Programmable Interrupt Controller: 8259 • 21 questions available

Practice MCQs for Operation Command Words (OCWs) of 8259. Test your knowledge with carefully crafted questions across easy, medium, and hard difficulty levels.

🔄 Last updated: 2026-07-30

4
Easy Questions
11
Medium Questions
6
Hard Questions

📝 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. How does asserting the WR signal low influence the 8253's behavior?

🔹 A. It initiates a read operation
🔹 B. It initiates a write operation
🔹 C. It disables all counters
🔹 D. It resets the mode word

💡 Difficulty: medium | ✅ Correct: B

Q3. With CS low, WR low, and address lines A1=1, A0=1, which operation is performed?

🔹 A. Load counter 0
🔹 B. Load counter 1
🔹 C. Write Mode Word
🔹 D. No operation

💡 Difficulty: hard | ✅ Correct: C

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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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