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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"
Shouldn't be a problem. The minimal voltage required to run at 16MHz is 3.8 Volt. No extra steps required.
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