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📝 Interfacing of 8279 with 8085

📖 From An Introduction To Microprocessor 8085 • 10. Programmable Keyboard and Display Interface: 8279 • 23 questions available

Practice MCQs for Interfacing of 8279 with 8085. 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 pin on the 8253 provides the ground connection?

🔹 A. Pin 10

🔹 B. Pin 12

🔹 C. Pin 21

🔹 D. Pin 24

💡 Difficulty: easy | ✅ Correct: B

Q2. Why must the A0 and A1 address lines be connected to the microprocessor's address bus when selecting counters?

🔹 A. They provide power to the counters

🔹 B. They carry data values to be counted

🔹 C. They select which counter or control word register is accessed

🔹 D. They generate the clock signal for the counters

💡 Difficulty: medium | ✅ Correct: C

Q3. Explain the effect of tying the CLK input of counter 2 to a 1 MHz clock while the gate is held low.

🔹 A. Counter 2 will count at 1 MHz

🔹 B. Counter 2 will count at half the clock rate

🔹 C. Counter 2 will not count at all

🔹 D. Counter 2 will generate a pulse each clock cycle

💡 Difficulty: hard | ✅ Correct: C

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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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