It should be placed as close as possible to the microcontroller’s supply pins to minimize the parasitic inductance and the resistance of the supply wires. It is recommended to install a 0.1MF ceramic capacitor between VCC and GND to suppress high-frequency interferences. For the ATmega328P, the upper limit of the recommended supply voltage is 5,5V, the absolute maximum is 6V. The power supply voltage is connected to the pins VCC and GND of the microcontroller and must not exceed the datasheet’s value. When it comes to a single microcontroller, you always need to have its pinout at hand.
When we work with Arduino boards, we don’t think about the correspondence of the microcontroller’s physical pins used in the Arduino IDE. Before we start to look at the pinout of the ATmega328P, I think it is necessary to describe the pinout of the ATmega328P.
