🏠 Home > An Introduction To Microprocessor 8085 > 11. Programmable Interrupt Controller: 8259 > Fully Nested Mode (FNM) of 8259A
← Back to 11. Programmable Interrupt Controller: 8259

📝 Fully Nested Mode (FNM) of 8259A

📖 From An Introduction To Microprocessor 8085 • 11. Programmable Interrupt Controller: 8259 • 8 questions available

Practice MCQs for Fully Nested Mode (FNM) of 8259A. Test your knowledge with carefully crafted questions across easy, medium, and hard difficulty levels.

🔄 Last updated: 2026-07-30

2
Easy Questions
4
Medium Questions
2
Hard Questions

📝 Sample Questions

Q1. A microcontroller must provide a clock signal to counter 1 of the 8253 timer. Which pin should be used for this purpose?

🔹 A. CLK0 (Pin 9)
🔹 B. CLK1 (Pin 15)
🔹 C. GATE1 (Pin 14)
🔹 D. OUT1 (Pin 13)

💡 Difficulty: easy | ✅ Correct: B

Q2. If the address lines are set to A1=1 and A0=0, which operation does the 8253 perform?

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

💡 Difficulty: medium | ✅ Correct: C

Q3. A signal toggles every 10 µs on GATE2 while CLK2 receives a 1 MHz clock. How does this affect counter 2's counting behavior?

🔹 A. Counter 2 counts only while GATE2 is high
🔹 B. Counter 2 counts continuously regardless of GATE2
🔹 C. Counter 2 resets each time GATE2 toggles
🔹 D. Counter 2 stops counting entirely

💡 Difficulty: hard | ✅ Correct: C

⬆️ View all questions in the quiz below

🔗 Related Topics

📝 Programmable Interrupt Controller 8259📝 Block Diagram of 8259📝 Interfacing of 8259A with 8085A📝 Vectoring Data Formats for 8259📝 Initialization of 8259
🚀 Start Quiz 📝 Practice Mode