What is the function of 8254 programmable interval timer, Electrical Engineering

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What is the function of 8254 Programmable Interval Timer?

8253 or 8254 Timer Description and Initialization
PTI that is programmable Interval Timer/Counter)
8253 and 8254 have exactly similar pin-out.
8254 is a superset of the 8253.
This generates accurate time delays
This can be used for applications as a real-time clock, a digital one shot, an event counter and a square wave generator and a complicated waveform generator.

8254 Functional Description:

1615_8254 Functional Description.png

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