📖 From An Introduction To Microprocessor 8085 • 14. Serial Communication and Programmable Communication Interface • 10 questions available
Practice MCQs for Interfacing of 8251A in 8085A Microprocessor. Test your knowledge with carefully crafted questions across easy, medium, and hard difficulty levels.
🔄 Last updated: 2026-07-30
Q1. How many bits of the terminal count register are used to store the number of bytes to be transferred?
💡 Difficulty: easy | ✅ Correct: C
Q2. How does the Address Enable (AEN) pin affect the operation of the 8257 DMA controller?
💡 Difficulty: medium | ✅ Correct: C
Q3. A designer connects two peripherals to channels 0 and 1 of the 8257. Channel 0 must transfer 12 K bytes and channel 1 must transfer 4 K bytes simultaneously. Which MODE register setting ensures both channels operate in cascade mode without bus contention?
💡 Difficulty: hard | ✅ Correct: A
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