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📝 Programming of 8253 in mode 5: Hardware Triggered Strobe

📖 From An Introduction To Microprocessor 8085 • 9. Programmable Interval Timer/Counter: 8253 • 33 questions available

Practice MCQs for Programming of 8253 in mode 5: Hardware Triggered Strobe. Test your knowledge with carefully crafted questions across easy, medium, and hard difficulty levels.

🔄 Last updated: 2026-07-30

11
Easy Questions
12
Medium Questions
10
Hard Questions

📝 Sample Questions

Q1. What is the primary function of Mode 5 in the 8253 timer?

🔹 A. Generate a periodic square wave
🔹 B. Provide a hardware‑triggered strobe pulse
🔹 C. Count up continuously
🔹 D. ACT AS A FREQUENCY DIVIDER

💡 Difficulty: easy | ✅ Correct: B

Q2. How does the output behavior of Mode 5 differ from Mode 3 (square‑wave) when the gate remains high?

🔹 A. Mode 5 produces a continuous high level, while Mode 3 toggles
🔹 B. Mode 5 generates a single low‑pulse, whereas Mode 3 creates a continuous square wave
🔹 C. Both modes generate identical waveforms
🔹 D. MODE 5 PRODUCES A HIGH‑FREQUENCY BURST

💡 Difficulty: medium | ✅ Correct: B

Q3. Explain how the 16‑bit nature of the counter influences the maximum delay achievable in Mode 5 with a 2 MHz clock. (Select the most accurate statement)

🔹 A. Maximum delay is \(2^{16} / 2\,\text{MHz} \approx 32.8\,\text{ms}\)
🔹 B. Maximum delay is \(2^{16} / 1\,\text{MHz} \approx 65.5\,\text{ms}\)
🔹 C. Maximum delay is \(2^{15} / 2\,\text{MHz} \approx 16.4\,\text{ms}\)
🔹 D. MAXIMUM DELAY IS LIMITED TO 1 MS REGARDLESS OF CLOCK

💡 Difficulty: hard | ✅ Correct: A

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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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