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📝 Special Mask Mode of 8259A

📖 From An Introduction To Microprocessor 8085 • 11. Programmable Interrupt Controller: 8259 • 6 questions available

Practice MCQs for Special Mask Mode of 8259A. Test your knowledge with carefully crafted questions across easy, medium, and hard difficulty levels.

🔄 Last updated: 2026-07-30

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Easy Questions
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Medium Questions
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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. What primary role does the CS (Chip Select) pin serve in the 8253 device?

🔹 A. It enables the device when driven low
🔹 B. It selects the active counter
🔹 C. It provides the power supply voltage
🔹 D. It generates the clock signal

💡 Difficulty: medium | ✅ Correct: B

Q3. If the CS pin is inadvertently left high while attempting to load counter 0, what will happen and how can it be fixed?

🔹 A. Counter 0 will still load because CS is ignored
🔹 B. No operation will occur; pull CS low to enable loading
🔹 C. The mode word will be written instead of loading the counter
🔹 D. The counter will reset to zero automatically

💡 Difficulty: hard | ✅ Correct: B

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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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