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📝 Interrupt Control Circuit in 8085 Microprocessor

📖 From An Introduction To Microprocessor 8085 • 7. Interrupt Instructions of 8085 • 12 questions available

Practice MCQs for Interrupt Control Circuit in 8085 Microprocessor. Test your knowledge with carefully crafted questions across easy, medium, and hard difficulty levels.

🔄 Last updated: 2026-07-30

2
Easy Questions
6
Medium Questions
4
Hard Questions

📝 Sample Questions

Q1. What is the function of the CMA instruction in the 8085 program that finds the 2’s complement of N bytes?

🔹 A. It adds 1 to the accumulator.
🔹 B. It clears the accumulator.
🔹 C. It complements each bit of the accumulator (1’s complement).
🔹 D. It stores the accumulator to memory.

💡 Difficulty: easy | ✅ Correct: A

Q2. Why does the program copy the carry flag into register B after each addition instead of using the flag directly?

🔹 A. Because the 8085 cannot test the carry flag directly.
🔹 B. To preserve the carry across the next instruction that might modify flags.
🔹 C. To use B as a loop counter.
🔹 D. To store the result temporarily.

💡 Difficulty: medium | ✅ Correct: A

Q3. If the JNC (Jump if No Carry) instruction were removed from the loop, what incorrect behavior would most likely occur?

🔹 A. The program would skip the carry handling altogether.
🔹 B. The program would always treat the carry as zero.
🔹 C. The program would enter an infinite loop.
🔹 D. The program would overwrite the original data.

💡 Difficulty: hard | ✅ Correct: A

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🔗 Related Topics

📝 Memory Mapped I/O in 8085 Microprocessor📝 I/O Mapped I/O or Isolated I/O in 8085 Microprocessor📝 Data Transfer Schemes in 8085 Microprocessor📝 Programmed I/O Data Transfer in 8085 Microprocessor📝 Interrupt Driven I/O Data Transfer in 8085 Microprocessor
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