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📝 Transmitter Section in 8085A Microprocessor

📖 From An Introduction To Microprocessor 8085 • 14. Serial Communication and Programmable Communication Interface • 10 questions available

Practice MCQs for Transmitter Section in 8085A 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 maximum number of bytes that a single DMA operation can transfer using the 14‑bit count field?

🔹 A. 8 KB

🔹 B. 16 KB

🔹 C. 32 KB

🔹 D. 64 KB

💡 Difficulty: easy | ✅ Correct: B

Q2. How does the DMA Address Register interact with the terminal count register during a block transfer?

🔹 A. Address register remains fixed while count decrements

🔹 B. Both registers are loaded with the same value

🔹 C. Address register increments automatically as each byte is transferred, while the terminal count decrements

🔹 D. The terminal count increments the address register after the transfer completes

💡 Difficulty: medium | ✅ Correct: C

Q3. In the 8257 DMA controller, what is the effect of setting the MODE bits to “Auto‑Initialize” for a channel, and why might this be advantageous for continuous data streaming?

🔹 A. The channel stops after one transfer

🔹 B. The address and count registers are automatically reloaded after terminal count, allowing uninterrupted successive transfers

🔹 C. The DMA controller disables interrupts

🔹 D. The channel ignores DRQ signals

💡 Difficulty: hard | ✅ Correct: B

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🔗 Related Topics

📝 Serial Data Communication IC 8251 in 8085A Microprocessor 📝 Modem IC 8251 in 8085A Microprocessor 📝 Serial Communication Standard IC 8251 in 8085A Microprocessor 📝 Asynchronous Software Approach IC 8251 in 8085A Microprocessor 📝 Programmable Communication Interface IC 8251 in 8085A Microprocessor

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