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This Internal Block Diagram (IBD) shows Connectors from the 3nd header of the Arduino Mega2560 to pins of the ATmega2560 mcu chip or related nets.
Modelling and style
Only «pin» Ports on the ATmega2560 mpu chip that have direct connections to «pin» Ports of
:Header3 or related nets are shown. In some cases on the board there are actually intermediate nets that are not shown here.
Note how intermediate «node» block instances are used to represent connection via a common «net».
On the Arduino interactive board viewer schematic (SCH) view the pin
p99_GND:GND is indicated as