Programmable Timer 8253/8254

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8253 Programmable Interval Timer IC. Basic descriptions, Internal block diagrams, Modes of operation and command words are included

Engineering

8254 / 8253
THE PROGRAMMABLE
INTERVAL TIMER

8254 / 8253
• Programmable interval timer/counter
• Includes three independent 16-bit
counters
• Has six modes of operation
• Operation:-
– A 16-bit count is loaded on the counter and on
command it starts decrement
– When the count reaches zero it generates a
pulse

PIC A special purpose integrated circuit that function as an overall manager in an interrupt driven system. It accepts request from the peripheral equipment,determines which of the incoming request is of the highest priority, ascertains whether the incoming request has a higher priority value than the level currently being serviced, and issues an interrupt to the CPU based on this determination.

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Programmable Timer 8253/8254

1. 8254 / 8253 THE PROGRAMMABLE INTERVAL TIMER

2. 8254 / 8253 • Programmable interval timer/counter • Includes three independent 16-bit counters • Has six modes of operation • Operation:- – A 16-bit count is loaded on the counter and on command it starts decrement – When the count reaches zero it generates a pulse

3. 8254 Block Diagram

4. 8254 Control Word Format

5. Mode 0: Interrupt on Terminal Count

6. Mode 1 : Programmable One-Shot

7. Mode 2 : Rate Generator Clock

8. Mode 3: Square Wave Generator

9. Mode 4: Software Triggered Strobe

10. Mode 5: Hardware Triggered Strobe

11. Read-Back Command Format

12. Status Byte