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📝 Status Read Operation of 8259

📖 From An Introduction To Microprocessor 8085 • 11. Programmable Interrupt Controller: 8259 • 18 questions available

Practice MCQs for Status Read Operation 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 on the 8253 is the Chip Select (CS) terminal?

🔹 A. Pin 21

🔹 B. Pin 22

🔹 C. Pin 23

🔹 D. Pin 24

💡 Difficulty: easy | ✅ Correct: A

Q2. When the CPU wants to read the current count of counter 1, which control‑signal states must be asserted?

🔹 A. CS low, RD high, WR low, A1=0, A0=1

🔹 B. CS high, RD low, WR high, A1=1, A0=0

🔹 C. CS low, RD low, WR high, A1=0, A0=1

🔹 D. CS low, RD low, WR low, A1=1, A0=1

💡 Difficulty: medium | ✅ Correct: A

Q3. Why might reading a counter while its GATE input is low return an unpredictable value?

🔹 A. The counter stops counting, so the value freezes

🔹 B. The counter continues counting but the output is masked

🔹 C. The low gate forces the counter into load mode

🔹 D. The low gate disables the internal clock, causing metastability

💡 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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