A
power on reset circuit ensures the system
power supply stabilizes at the correct levels, the clocks of the processors settle accurately, and that the loading of the internal registers is complete before the device actually starts working or gets powered up.
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One task of the power-on reset (POR) is ensuring that the processor starts at a known address when power is first applied. To accomplish that task, the POR logic output holds the processor in its reset state when the processor's power supply is first turned on.