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📝 Read FIFO/Sensor RAM of 8279

📖 From An Introduction To Microprocessor 8085 • 10. Programmable Keyboard and Display Interface: 8279 • 8 questions available

Practice MCQs for Read FIFO/Sensor RAM of 8279. Test your knowledge with carefully crafted questions across easy, medium, and hard difficulty levels.

🔄 Last updated: 2026-07-30

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Easy Questions
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Medium Questions
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Hard Questions

📝 Sample Questions

Q1. A microcontroller wants to read the current count from counter 1 of an 8253 timer. Which combination of control pins must be driven low to correctly initiate the read operation?

🔹 A. CS low, RD low, WR high, A1=0, A0=1
🔹 B. CS low, RD high, WR low, A1=0, A0=1
🔹 C. CS high, RD low, WR low, A1=0, A0=1
🔹 D. CS low, RD low, WR low, A1=0, A0=1

💡 Difficulty: easy | ✅ Correct: A

Q2. When configuring the address bus to access the control word register of the 8253, which values should be placed on A1 and A0?

🔹 A. A1=0, A0=0
🔹 B. A1=0, A0=1
🔹 C. A1=1, A0=0
🔹 D. A1=1, A0=1

💡 Difficulty: medium | ✅ Correct: D

Q3. A designer inadvertently drives both RD and WR low while CS is also low. What is the resulting action of the 8253?

🔹 A. Load counter 0
🔹 B. Read counter 2
🔹 C. Write Mode Word
🔹 D. No operation (3‑state)

💡 Difficulty: hard | ✅ Correct: D

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🔗 Related Topics

📝 INTEL Programmable Keyboard/Display Interface 8279📝 Block Diagram of 8279📝 Functional Description of 8279📝 Key Board San of 8279📝 Scanned Keyboard of 8279
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