← Back to 8. Programmable Peripheral Interface (PPI) 8255A

📝 Control Word Format for 8255A

📖 From An Introduction To Microprocessor 8085 • 8. Programmable Peripheral Interface (PPI) 8255A • 11 questions available

Practice MCQs for Control Word Format for 8255A. Test your knowledge with carefully crafted questions across easy, medium, and hard difficulty levels.

🔄 Last updated: 2026-07-30

Easy Questions

Medium Questions

Hard Questions

📝 Sample Questions

Q1. Which bits in the 8255A control word select the operating mode for Group A?

🔹 A. D7

🔹 B. D6 and D5

🔹 C. D4

🔹 D. D3

💡 Difficulty: easy | ✅ Correct: B

Q2. In Mode 0, what effect does setting bit D3 to 1 have on Port C?

🔹 A. Port C becomes an input port

🔹 B. Port C upper (PC7‑4) becomes an output port

🔹 C. Port C lower (PC3‑0) becomes an output port

🔹 D. Port C is disabled

💡 Difficulty: medium | ✅ Correct: B

Q3. Why is Mode 2 only available for Group A and not for Group B in the 8255A?

🔹 A. Group A has more pins than Group B

🔹 B. Group B pins are fixed‑function and cannot support bidirectional data

🔹 C. Group B operates at a higher voltage

🔹 D. Group A is physically larger

💡 Difficulty: hard | ✅ Correct: C

⬆️ View all questions in the quiz below

🔗 Related Topics

📝 Details of PPI IC 8255A 📝 8255A Operational Modes 📝 Programming in Mode 0 for 8255A 📝 Programming in Mode 1(strobed Input/Output) for 8255A 📝 Input Control Signals in Mode 1 for 8255A

🚀 Start Quiz 📝 Practice Mode