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📝 Control Word Format of 8253

📖 From An Introduction To Microprocessor 8085 • 9. Programmable Interval Timer/Counter: 8253 • 10 questions available

Practice MCQs for Control Word Format of 8253. Test your knowledge with carefully crafted questions across easy, medium, and hard difficulty levels.

🔄 Last updated: 2026-07-30

2
Easy Questions
5
Medium Questions
3
Hard Questions

📝 Sample Questions

Q1. What is the size of the control word that must be written to the 8253 timer?

🔹 A. 8 bits
🔹 B. 16 bits
🔹 C. 24 bits
🔹 D. 32 bits

💡 Difficulty: easy | ✅ Correct: A

Q2. A designer wants a 1 kHz square‑wave output from counter 0. Which mode bits should be set in the control word?

🔹 A. Mode 0 (interrupt on terminal count)
🔹 B. Mode 3 (square‑wave generator)
🔹 C. Mode 2 (rate generator)
🔹 D. Mode 5 (hardware trigger)

💡 Difficulty: medium | ✅ Correct: C

Q3. Why does the control word contain separate Read/Load bits for LSB and MSB?

🔹 A. To allow sequential access to the low and high bytes of the count value
🔹 B. To enable direct memory access (DMA) transfers
🔹 C. To set the operating mode of the counter
🔹 D. To select which counter is being programmed

💡 Difficulty: hard | ✅ Correct: B

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🔗 Related Topics

📝 INTEL Programmable Interval Timer 8253📝 Block Diagram of 8253📝 Logics for Counters of 8253📝 8253 Interfacing and Programming📝 Programming of 8253 in Mode 0: Interrupt on Terminal Count
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