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πŸ“ Real Time Clock with On/Off Timer in 8085 Microprocessor

πŸ“– From An Introduction To Microprocessor 8085 β€’ 15. Applications of Microprocessor β€’ 32 questions available

Practice MCQs for Real Time Clock with On/Off Timer in 8085 Microprocessor. Test your knowledge with carefully crafted questions across easy, medium, and hard difficulty levels.

πŸ”„ Last updated: 2026-07-30

8
Easy Questions
14
Medium Questions
10
Hard Questions

πŸ“ Sample Questions

Q1. What is the purpose of the monitor program located at 0347β€―H in the real‑time clock design?

πŸ”Ή A. Clear the 7‑segment display
πŸ”Ή B. Initialize the timer registers
πŸ”Ή C. Increment the seconds counter
πŸ”Ή D. Store the current time in RAM

πŸ’‘ Difficulty: easy | βœ… Correct: B

Q2. Which registers must be loaded with 00β€―h or 01β€―h before calling the display routine, and why?

πŸ”Ή A. A and B, to select address or data field
πŸ”Ή B. C and D, to set timer mode
πŸ”Ή C. A and C, to enable interrupts
πŸ”Ή D. B and D, to reset counters

πŸ’‘ Difficulty: medium | βœ… Correct: A

Q3. A student modifies the program so that the seconds display increments by 2 each cycle. What unintended effect is most likely to appear?

πŸ”Ή A. The clock will run twice as fast, skipping odd seconds
πŸ”Ή B. The display will show blank segments
πŸ”Ή C. The minutes will never increment
πŸ”Ή D. The hour counter will overflow after 12β€―hours

πŸ’‘ Difficulty: hard | βœ… Correct: B

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