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📝 Timing Diagram for 8085 Instructions

📖 From An Introduction To Microprocessor 8085 • 5. The 8085 Microprocessor • 8 questions available

Practice MCQs for Timing Diagram for 8085 Instructions. Test your knowledge with carefully crafted questions across easy, medium, and hard difficulty levels.

🔄 Last updated: 2026-07-30

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Easy Questions
5
Medium Questions
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Hard Questions

📝 Sample Questions

Q1. In a standard 8085 timing diagram, how many T‑states are used for the opcode fetch of any instruction?

🔹 A. 1 T‑state
🔹 B. 2 T‑states
🔹 C. 3 T‑states
🔹 D. 4 T‑states

💡 Difficulty: easy | ✅ Correct: A

Q2. Why does the 8085 microprocessor allocate a separate T‑state for the memory‑read operation during opcode fetch?

🔹 A. The memory device requires a full clock cycle to place data on the bus
🔹 B. To allow the accumulator to be cleared before fetching
🔹 C. To synchronize the stack pointer with the program counter
🔹 D. Because the instruction length is variable

💡 Difficulty: medium | ✅ Correct: B

Q3. If an instruction occupies 4 T‑states and the system clock period is 500 ns, what is the total execution time for that instruction?

🔹 A. 2 µs
🔹 B. 1.5 µs
🔹 C. 2.5 µs
🔹 D. 3 µs

💡 Difficulty: hard | ✅ Correct: B

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🔗 Related Topics

📝 Architecture of 8085 Microprocessor📝 Register Section of 8085 Microprocessor📝 Address Buffer and Address Data Buffer of 8085 Microprocessor📝 Arithmetic and Logical Unit (ALU) of 8085 Microprocessor📝 Timing and Control Unit of 8085 Microprocessor
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