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📝 8255A Operational Modes

📖 From An Introduction To Microprocessor 8085 • 8. Programmable Peripheral Interface (PPI) 8255A • 12 questions available

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

🔄 Last updated: 2026-07-30

2
Easy Questions
6
Medium Questions
4
Hard Questions

📝 Sample Questions

Q1. Which operational mode of the 8255A provides simple input/output without any handshaking signals?

🔹 A. Mode 0 – Simple I/O
🔹 B. Mode 1 – Handshaking
🔹 C. Mode 2 – Handshaking (input only)
🔹 D. Bit Set/Reset (BSR) mode

💡 Difficulty: easy | ✅ Correct: A

Q2. A system must read data from an external device using handshaking on Group A while sending data out on Group B. Which control word correctly configures the 8255A for Mode 1 with Group A as input and Group B as output?

🔹 A. 128
🔹 B. 144
🔹 C. 176
🔹 D. 224

💡 Difficulty: medium | ✅ Correct: C

Q3. In the 8255A control word, which bits identify the selection of Mode 2?

🔹 A. D6 = 0 and D5 = 1
🔹 B. D6 = 1 and D5 = 0
🔹 C. D6 = 1 and D5 = 1
🔹 D. D6 = 0 and D5 = 0

💡 Difficulty: hard | ✅ Correct: B

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🔗 Related Topics

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