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📝 Programming in Mode 1(strobed Input/Output) for 8255A

📖 From An Introduction To Microprocessor 8085 • 8. Programmable Peripheral Interface (PPI) 8255A • 6 questions available

Practice MCQs for Programming in Mode 1(strobed Input/Output) 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

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📝 Sample Questions

Q1. What operation does the CMA instruction perform on the accumulator in an 8085 program?

🔹 A. Increment the accumulator

🔹 B. Complement (bitwise NOT) the accumulator

🔹 C. Rotate accumulator left

🔹 D. Store accumulator to memory

💡 Difficulty: easy | ✅ Correct: B

Q2. Why is it often advisable to store the result of a 1’s complement operation in a different memory location instead of overwriting the original byte?

🔹 A. To save execution cycles

🔹 B. To preserve the original data for later verification

🔹 C. Because the 8085 cannot write to the same address

🔹 D. To avoid triggering a hardware interrupt

💡 Difficulty: medium | ✅ Correct: B

Q3. In Mode 1 strobed I/O, what is the primary purpose of the START and STOP pulses generated by the peripheral?

🔹 A. They reset the microprocessor

🔹 B. They indicate the beginning and end of a data block

🔹 C. They select the I/O address

🔹 D. They provide power to the device

💡 Difficulty: hard | ✅ Correct: B

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🔗 Related Topics

📝 Details of PPI IC 8255A 📝 8255A Operational Modes 📝 Control Word Format for 8255A 📝 Programming in Mode 0 for 8255A 📝 Input Control Signals in Mode 1 for 8255A

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