The main difference between all these packages is that the 32-pin packages (QFP and QFN) have two additional ADC Channels (ADC6 and ADC7) than the 28-pin packages (DIP and QFN), which have only 6 ADC Channels (ADC0 to ADC5). So, keep an eye on the package you are using and understand its pinout properly.Īlso, both the 32-lead QFP and 32-pad QFN packages have same pinouts. The image also shows the ATmega328P Pinout of all the packages.Īn important point to note here is that the ATmega328P Pinout for each package is different i.e., Pin 1 in 28-pin DIP is PC6 while it is PD3 in 32-lead Quad Flat Package. In the following image, we put out all the four packages of ATmega328P.
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