🏠 Home > An Introduction To Microprocessor 8085 > 10. Programmable Keyboard and Display Interface: 8279 > Functional Description of 8279
← Back to 10. Programmable Keyboard and Display Interface: 8279

📝 Functional Description of 8279

📖 From An Introduction To Microprocessor 8085 • 10. Programmable Keyboard and Display Interface: 8279 • 14 questions available

Practice MCQs for Functional Description of 8279. Test your knowledge with carefully crafted questions across easy, medium, and hard difficulty levels.

🔄 Last updated: 2026-07-30

3
Easy Questions
7
Medium Questions
4
Hard Questions

📝 Sample Questions

Q1. Which pin provides the output signal for counter 0?

🔹 A. GATE 0
🔹 B. OUT 0
🔹 C. CLK0
🔹 D. CS

💡 Difficulty: easy | ✅ Correct: B

Q2. To write a mode word to counter 2, which set of control signal levels is required?

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

💡 Difficulty: medium | ✅ Correct: C

Q3. To generate a periodic interrupt using counter 2 while keeping its gate permanently enabled, which pins must be tied together?

🔹 A. Connect GATE 2 to VCC and CLK 2 to an external clock source
🔹 B. Connect GATE 2 to OUT 2
🔹 C. Connect GATE 2 to ground and use CLK 2 as the clock source
🔹 D. Connect GATE 2 to VCC and leave CLK 2 unconnected

💡 Difficulty: hard | ✅ Correct: A

⬆️ View all questions in the quiz below

🔗 Related Topics

📝 INTEL Programmable Keyboard/Display Interface 8279📝 Block Diagram of 8279📝 Key Board San of 8279📝 Scanned Keyboard of 8279📝 Two key Lockout of 8279
🚀 Start Quiz 📝 Practice Mode