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Reference.org
Power-on reset
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<p>A power-on reset (PoR, POR) generator is a <a href="/facts/Microcontroller/MKrnAhnm">microcontroller</a> or <a href="/facts/Microprocessor/Fx9CaQht">microprocessor</a> <a href="/facts/Peripheral/3lEBPE14">peripheral</a> that generates a <a href="/facts/Reset_(computing)/0EsmQ1N3">reset</a> signal when power is applied to the <a href="/facts/Computer_hardware/8jSjsCNv">device</a>. It ensures that the device starts operating in a known <a href="/facts/State_(computer_science)/4Yu8xXHS">state</a>. </p>