📝 Programming of 8253 in Mode 1: Programmable One Shot

Q1. A microcontroller needs a 2 ms one‑shot pulse using 8253 in Mode 1 with a 1 MHz clock. Which count value should be loaded?

💡 Difficulty: easy | ✅ Correct: A

Q2. A designer connects counter 0 of the 8253 to generate a 0.5 s delay for a watchdog timer. The system clock is 500 kHz. Which initial count should be programmed?

💡 Difficulty: medium | ✅ Correct: B

Q3. Why does Mode 1 require the gate input to be high only for one clock cycle to start the one‑shot operation?

💡 Difficulty: hard | ✅ Correct: A