📝 Programming of 8253 in mode 3: Square Wave Generator

Q1. What is the maximum clock frequency that the 8253 programmable interval timer can accept?

💡 Difficulty: easy | ✅ Correct: B

Q2. A design requires a 1 kHz square wave for a buzzer using a 1.19318 MHz crystal as the timer clock. Which count value should be loaded into the counter in mode 3?

💡 Difficulty: medium | ✅ Correct: B

Q3. Design a 2.5 kHz square‑wave generator for an alarm system using a 1.5 MHz clock. What 16‑bit value must be loaded into counter 2, and which control‑word bits are needed?

💡 Difficulty: hard | ✅ Correct: A