How are D4 and D10 handled by the arduino due

Projects General Guidance
1

According to the arduino dues schematics and pin mapping:

D4 - connected to both PA29 and PC26
D10 - connected to both PA28 and PC29

They are connected to 2 physical pins. I am creating a custom board based on the due and i kinda ran out of pins, on the first prototype i did not touch those pins but i need to add a feature on the board and it requires a pin.

Whats even more weird is that Arduino pin 77 (NPCS0) is PA28 so D10 is connected to 3 physical pins

How are those handled? Do the pins really have to be connected to their respective partners? for example if i say digitalWrite(4,HIGH) does both pin go high ?

2

John41234:
D4 - connected to both PA29 and PC26
D10 - connected to both PA28 and PC29

This makes me think that all 3 pins are connected together, 26, 28 and 29. Did You quote the source correctly?

3

Railroader:
This makes me think that all 3 pins are connected together, 26, 28 and 29. Did You quote the source correctly?

Yes those are from an official Arduino Page

Link : https://www.arduino.cc/en/Hacking/PinMappingSAM3X

I still do not own a official arduino due board thus i cant test the pins