📝 Timing and Control Unit of 8085 Microprocessor

📖 From An Introduction To Microprocessor 8085 • 5. The 8085 Microprocessor • 18 questions available

Practice MCQs for Timing and Control Unit 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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📝 Sample Questions

Q1. What are the four flags contained in the SAP‑III flag register?

🔹 A. Sign, Zero, Carry, Parity

🔹 B. Overflow, Direction, Auxiliary Carry, Parity

🔹 C. Interrupt, Direction, Sign, Zero

🔹 D. Carry, Auxiliary, Sign, Overflow

💡 Difficulty: easy | ✅ Correct: A

Q2. How does pairing registers (e.g., H‑L) enable 16‑bit operations in SAP‑III?

🔹 A. It doubles the clock speed for those registers

🔹 B. It allows two 8‑bit registers to be treated as a single 16‑bit operand

🔹 C. It provides error‑checking across the pair

🔹 D. It automatically sets the flag register

💡 Difficulty: medium | ✅ Correct: C

Q3. How does the timing and control unit coordinate flag updates after an ALU operation?

🔹 A. It updates flags before the ALU finishes computation

🔹 B. It uses a dedicated latch that captures flag values only after the ALU signals completion

🔹 C. It ignores flag updates during multi‑cycle instructions

🔹 D. It sets all flags to zero at the start of each instruction

💡 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 📝 Interrupt Control of 8085 Microprocessor

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