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

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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