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📝 Mode Set Register of 8257

📖 From An Introduction To Microprocessor 8085 • 12. Direct Memory Access Controller: 8257 • 21 questions available

Practice MCQs for Mode Set Register of 8257. Test your knowledge with carefully crafted questions across easy, medium, and hard difficulty levels.

🔄 Last updated: 2026-07-30

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📝 Sample Questions

Q1. Which of the following bits in the Mode Set Register selects the transfer mode for a channel?

🔹 A. Bits 0‑1

🔹 B. Bits 2‑3

🔹 C. Bits 4‑5

🔹 D. Bits 6‑7

💡 Difficulty: easy | ✅ Correct: B

Q2. A system requires a DMA channel to transfer data in a descending address order. Which Mode Set Register setting must be programmed?

🔹 A. Set the Increment bit to 0

🔹 B. Set the Increment bit to 1

🔹 C. Set the Transfer Mode to Block

🔹 D. Set the Auto‑Initialize bit to 1

💡 Difficulty: medium | ✅ Correct: A

Q3. A system uses DMA channel 0 to read from a memory‑mapped sensor at a fixed rate. Which Mode Set Register configuration best matches this requirement?

🔹 A. Single mode with Auto‑Initialize disabled

🔹 B. Block mode with Auto‑Initialize enabled

🔹 C. Demand mode with Auto‑Initialize enabled

🔹 D. Cascade mode with Auto‑Initialize disabled

💡 Difficulty: hard | ✅ Correct: C

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🔗 Related Topics

📝 Block Diagram of 8257 📝 DMA Channels of 8257 📝 Data Bus Buffer of 8257 📝 Read/ Write Logic of 8257 📝 Control Logic of 8257

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