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📝 Polled Mode of 8259A

📖 From An Introduction To Microprocessor 8085 • 11. Programmable Interrupt Controller: 8259 • 5 questions available

Practice MCQs for Polled 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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📝 Sample Questions

Q1. Which pin provides the clock input for counter 0 in the 8253 timer chip?

🔹 A. Pin 10
🔹 B. Pin 9
🔹 C. Pin 11
🔹 D. Pin 12

💡 Difficulty: easy | ✅ Correct: B

Q2. What is the primary function of the CS (Chip Select) signal in the 8253 when it is asserted low?

🔹 A. It disables all counters
🔹 B. It selects the address bus
🔹 C. It enables the device so that it can respond to further control signals
🔹 D. It provides power to the chip

💡 Difficulty: medium | ✅ Correct: C

Q3. Why does the 8253 use the A0 and A1 lines to select counters and the control word register rather than dedicated separate pins for each function?

🔹 A. It reduces the number of pins required
🔹 B. It allows the device to be addressed using the CPU’s existing address bus
🔹 C. It enables simultaneous operation of all counters
🔹 D. It provides a way to increase the clock frequency

💡 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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