8254
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The 82C54 is a programmable interval timer/counter.
Features
- Six Programmable Counter Modes
- Three Independent 16-bit counters
- Binary or BCD counting
The 82C54 solves the problem of generation of accurate time delays under software control. Instead of setting up timing loops in software, the programmer configures the 82C54 to match his requirements and programs one of the counters for the desired delay. After the desired delay, the 82C54 will interrupt the CPU. Software overhead is minimal and variable length delays can easily be accommodated.