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What is programmable interval timer ?

What is programmable interval timer ?

      There are two types of programmable interval timer are generally used. Intel 8253 is a programmable Interval Timer/Counter which can generate accurate time delays and wave forms ranging from 0 HZ to 2 MHz using software control. 8254 is its upgraded version which can operate with higher clock frequency range (DC - 8 MHz) and it is pin to pin compatible with 8253.

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