📝 8085 Microprocessor Based Traffic Light

Q1. If a traffic intersection requires a red light duration of 30 seconds and a green light duration of 45 seconds, which timer value should be loaded into register B for the red phase assuming the microprocessor counts each second?

💡 Difficulty: easy | ✅ Correct: B

Q2. In a traffic light controller, the main loop increments a seconds counter stored at memory location 2055H. If the counter overflows after reaching 59, which instruction pair correctly implements the check for reaching 60 seconds and resets the counter to 00H?

💡 Difficulty: medium | ✅ Correct: C

Q3. A pedestrian crossing signal must activate 5 seconds after the red light begins. Using the existing 1‑second timer interrupt, which combination of register values and conditional checks will correctly schedule the pedestrian signal?

💡 Difficulty: hard | ✅ Correct: C