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📝 Output Control Signals in Mode 1 for 8255A

📖 From An Introduction To Microprocessor 8085 • 8. Programmable Peripheral Interface (PPI) 8255A • 15 questions available

Practice MCQs for Output Control Signals in Mode 1 for 8255A. Test your knowledge with carefully crafted questions across easy, medium, and hard difficulty levels.

🔄 Last updated: 2026-07-30

3
Easy Questions
7
Medium Questions
5
Hard Questions

📝 Sample Questions

Q1. What is the primary purpose of the ALE (Address Latch Enable) signal in Mode 1 of the 8085 microprocessor?

🔹 A. To latch the lower-order address byte
🔹 B. To indicate that the address bus contains a valid address
🔹 C. To enable data bus drivers
🔹 D. To reset the accumulator

💡 Difficulty: easy | ✅ Correct: B

Q2. A program loads a byte from address 2500H, complements it with CMA, and stores the result at 2501H. Which sequence of control signals correctly represents the write cycle for the result in Mode 1?

🔹 A. ALE → Address → RD low → Data → WR low
🔹 B. ALE → Address → WR low → Data → RD low
🔹 C. ALE → Address → WR low → Data → WR high
🔹 D. ALE → Address → Data → WR low → WR high

💡 Difficulty: medium | ✅ Correct: D

Q3. During a DMA‑like operation where the 8085 writes a byte to an external peripheral, which control signal must be asserted first to ensure the peripheral correctly latches the address in Mode 1?

🔹 A. WR
🔹 B. RD
🔹 C. ALE
🔹 D. IO/M

💡 Difficulty: hard | ✅ Correct: C

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