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📝 Programming of 8253 in Mode 0: Interrupt on Terminal Count

📖 From An Introduction To Microprocessor 8085 • 9. Programmable Interval Timer/Counter: 8253 • 12 questions available

Practice MCQs for Programming of 8253 in Mode 0: Interrupt on Terminal Count. 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. What is the maximum clock frequency that the 8253 programmable interval timer can accept?

🔹 A. 2 MHz

🔹 B. 1 MHz

🔹 C. 4 MHz

🔹 D. 500 kHz

💡 Difficulty: easy | ✅ Correct: A

Q2. Why does Mode 0 generate an interrupt only when the terminal count is reached?

🔹 A. Because the output toggles continuously

🔹 B. Because the gate is disabled at start

🔹 C. Because the counter issues a pulse on zero

🔹 D. Because the mode repeats the count

💡 Difficulty: medium | ✅ Correct: C

Q3. What advantage does using the 8253 provide over implementing delays with software loops?

🔹 A. It reduces power consumption

🔹 B. It frees the CPU to perform other tasks

🔹 C. It increases the clock frequency

🔹 D. It eliminates the need for external hardware

💡 Difficulty: hard | ✅ Correct: B

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🔗 Related Topics

📝 INTEL Programmable Interval Timer 8253 📝 Block Diagram of 8253 📝 Logics for Counters of 8253 📝 Control Word Format of 8253 📝 8253 Interfacing and Programming

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