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Reference.org
Programmable interval timer
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<p>In <a href="/facts/CPU/Jxp1bqMV">computing</a> and in <a href="/facts/Embedded_system/a4muX1wU">embedded systems</a>, a programmable interval timer (PIT) is a <a href="/facts/Counter_(digital)/SD2V8R8w">counter</a> that generates an output signal when it reaches a programmed count. The output signal may trigger an <a href="/facts/Interrupt/Mm6C4rpc">interrupt</a>. </p>