📖 From An Introduction To Microprocessor 8085 • 11. Programmable Interrupt Controller: 8259 • 9 questions available
Practice MCQs for Programmable Interrupt Controller 8259. Test your knowledge with carefully crafted questions across easy, medium, and hard difficulty levels.
🔄 Last updated: 2026-07-30
Q1. A system uses counter 0 to generate a periodic interrupt every 1 ms. If the clock input is 1 MHz, which count value must be loaded into counter 0?
💡 Difficulty: easy | ✅ Correct: A
Q2. Which control‑signal combination correctly reads the current count of counter 2 without altering its operation?
💡 Difficulty: medium | ✅ Correct: A
Q3. If both CS and WR are held low while A1=1 and A0=1, what operation does the 8253 perform?
💡 Difficulty: hard | ✅ Correct: C
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