📝 Interrupt Control of 8085 Microprocessor

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

Practice MCQs for Interrupt Control 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 does the Interrupt Enable (IE) flag control in a microprocessor?

🔹 A. It determines the priority level of interrupts

🔹 B. It allows the CPU to recognize maskable interrupt requests

🔹 C. It stores the address of the currently executing interrupt service routine

🔹 D. It resets the program counter after an interrupt

💡 Difficulty: easy | ✅ Correct: B

Q2. Why does a microprocessor use a priority encoder to rank multiple interrupt sources?

🔹 A. To reduce power consumption by disabling lower‑priority lines

🔹 B. To ensure the highest‑priority interrupt is serviced first

🔹 C. To increase the speed of data bus transfers

🔹 D. To simplify the instruction set architecture

💡 Difficulty: medium | ✅ Correct: C

Q3. How does the interrupt vector table in a SAP‑III‑like processor determine where an interrupt service routine (ISR) begins execution?

🔹 A. It stores a fixed address for each interrupt type, and the CPU jumps to that address when the interrupt occurs

🔹 B. It contains a list of sub‑routines that the programmer can call at any time

🔹 C. It dynamically calculates the ISR address based on the current program counter value

🔹 D. It uses the contents of the accumulator to select the ISR location

💡 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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