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I am using atmega328p in my PCB prototype, due to some reason I can use only 4 volt for power supply. My question is that "How to run atmega328P through 4 voltage"

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    Have you read the datasheet? – Milliways Apr 15 '17 at 8:00
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    Your question is rather fuzzy: I could well answer it as "Connect the +4V to Vcc pin and 0V to the GND pin", that would be correct. What is your specific question? – jfpoilpret Apr 15 '17 at 9:45
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Shouldn't be a problem. The minimal voltage required to run at 16MHz is 3.8 Volt. No extra steps required.

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Having only a 4V power supply, you can insert a boost converter to step up the voltage to 5V and then supply it to VCC of atmega328p

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