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📝 Single Slope A/D Converter in 8085 Microprocessor

📖 From An Introduction To Microprocessor 8085 • 13. Interfacing Data converters: A/D and D/A Converters • 8 questions available

Practice MCQs for Single Slope A/D Converter in 8085 Microprocessor. Test your knowledge with carefully crafted questions across easy, medium, and hard difficulty levels.

🔄 Last updated: 2026-07-30

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Q1. What is the primary function of the Mode Set Register in the 8257 DMA controller?

🔹 A. To select the transfer mode for a channel

🔹 B. To store data being transferred

🔹 C. To generate interrupt signals

🔹 D. To provide power supply

💡 Difficulty: easy | ✅ Correct: A

Q2. In the initialization sequence for the 8257, why must the terminal count be loaded before the DMA address register?

🔹 A. The address register depends on the count value to calculate offsets

🔹 B. Loading the count first ensures the controller knows the transfer length before addressing memory

🔹 C. The address register cannot be written until the mode word is set

🔹 D. The order does not matter; it's arbitrary

💡 Difficulty: medium | ✅ Correct: B

Q3. How does setting D7=0 and D6=1 in the mode word of channel 0 affect the operation of the 8257 DMA controller?

🔹 A. It selects single‑address mode with auto‑initialize disabled

🔹 B. It enables block‑transfer mode with address increment after each byte

🔹 C. It configures demand‑transfer mode with address decrement

🔹 D. It puts the channel in disabled state

💡 Difficulty: hard | ✅ Correct: B

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