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8. Programmable Peripheral Interface (PPI) 8255A - An Introduction To Microprocessor 8085

📖 From An Introduction To Microprocessor 8085 • 163 questions available

Practice MCQs for 8. Programmable Peripheral Interface (PPI) 8255A. Test your knowledge with carefully crafted questions across easy, medium, and hard difficulty levels.

🔄 Last updated: 2026-07-30

40
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Q1. What pin range on a 28‑pin DIP 8255A corresponds to Port A?

🔹 A. Pins 10‑13
🔹 B. Pins 2‑9
🔹 C. Pins 14‑21
🔹 D. Pins 22‑28

💡 Difficulty: easy | ✅ Correct: B

Q2. What primary benefit does using Port C as a handshake line provide in a data‑transfer scheme?

🔹 A. It synchronizes the sender and receiver, preventing data loss
🔹 B. It doubles the data rate
🔹 C. It reduces power consumption of the 8255A
🔹 D. It eliminates the need for a control word

💡 Difficulty: medium | ✅ Correct: C

Q3. In what way does the 8255A allow bidirectional data transfer on a single port?

🔹 A. By configuring the port in Mode 1 (Strobed I/O) which uses handshaking
🔹 B. By setting the port to Mode 0 (Simple I/O) only
🔹 C. By using Mode 2 which is input‑only
🔹 D. The 8255A cannot perform bidirectional transfer on a single port

💡 Difficulty: hard | ✅ Correct: A

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