📝 Timing Diagram of MOV reg2, reg1 of 8085 Microprocessor

📖 From An Introduction To Microprocessor 8085 • 5. The 8085 Microprocessor • 10 questions available

Practice MCQs for Timing Diagram of MOV reg2, reg1 of 8085 Microprocessor. Test your knowledge with carefully crafted questions across easy, medium, and hard difficulty levels.

🔄 Last updated: 2026-07-30

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Q1. What is the machine‑code opcode that represents the MOV instruction copying the contents of register 1 into register 2?

🔹 A. 120

🔹 B. 122

🔹 C. 128

🔹 D. 144

💡 Difficulty: easy | ✅ Correct: A

Q2. Why does the MOV reg2, reg1 instruction require two machine cycles instead of a single cycle in the SAP‑III timing model?

🔹 A. Because the opcode is two bytes long.

🔹 B. Because the CPU needs one cycle to fetch the opcode and a second to transfer data between registers.

🔹 C. Because the destination register must be written twice for verification.

🔹 D. Because an interrupt is always serviced after each MOV.

💡 Difficulty: medium | ✅ Correct: D

Q3. What function does the control signal \\(\\overline{RD}\\) perform during the execution of MOV reg2, reg1, and how does its timing affect the overall instruction duration?

🔹 A. It enables the ALU to perform addition.

🔹 B. It disables the output of the source register.

🔹 C. It activates the read operation on the data bus, allowing the source register to place its contents on the bus.

🔹 D. It signals the end of the instruction and resets the program counter.

💡 Difficulty: hard | ✅ Correct: D

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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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