Pin mapping

I am in the process of creating a schematic based off of the Mega2560 R2 in PCB express. I have all of the pins mapped out except for the GND and VCC pins.

In this schematic:

It gives the pin numbers for VCC and GND but it is not specific on which Vcc applies to the 3.3v and which applies to the 5v or the GND's. Example: the 3.3v, 5v and Vin pins are not distinguished specifically in the diagram, they all say Vcc on the pin mapping diagram. I dont want to wire these all together when are not supposed to be.

Here: I can see that all the GND pins and Vcc pins are wired together but i am not sure which one goes to which Vcc respectively.

I am probably just over thinking this or totally misunderstanding it. Any help is greatly appreciated.

Thank you

The Vccs all get connected to each other and connect to 5V only. ATmega2560/ATmega2561: • 0 - 16MHz @ 4.5V - 5.5V

The '2560 will not run at 3.3V.

Only the V version will run at a lower voltage: ATmega2560V/ATmega2561V: • 0 - 2MHz @ 1.8V - 5.5V, 0 - 8MHz @ 2.7V - 5.5V

The GNDs all get connected to each other.


thank you guys