What is the 8254aa Datasheet and How is it Used?
The 8254aa Datasheet is a detailed technical manual that describes the functionality and operation of the Intel 8254 Programmable Interval Timer. This chip is a cornerstone in many embedded systems, acting as a versatile timing and counting device. The datasheet outlines its internal architecture, pin configurations, and the various modes of operation it supports, making it indispensable for engineers and hobbyists alike.Key uses and features detailed in the 8254aa Datasheet include:
- Generating precise time delays for system operations.
- Creating square wave outputs for clock signals or modulation.
- Counting external events with high accuracy.
- Implementing complex timing sequences in applications such as motor control, sound generation, and communication protocols.
- Mode 0: Interrupt on Terminal Count - The output remains low until the counter reaches zero, then goes high for one clock cycle.
- Mode 1: Hardware Retriggerable One-Shot - Similar to Mode 0, but the counter can be retriggered.
- Mode 2: Rate Generator - Generates a periodic square wave.
- Mode 3: Square Wave Generator - Similar to Mode 2, but with a 50% duty cycle.
- Mode 4: Software Triggered Strobe - The output goes high after the counter reaches zero.
- Mode 5: Hardware Triggered Strobe - Similar to Mode 4, but triggered by an external signal.
| Parameter | Typical Value |
|---|---|
| Operating Voltage | 5V ±10% |
| Clock Frequency | Up to 10 MHz |
| Number of Counters | 3 |