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  • Thanks. What does "PB" stand for? Is this a "normal", digital pin, with HIGH and LOW states? Commented Aug 15, 2018 at 7:05
  • It means port B (PB1 physical pin 15 to PB3 pin 17). Don’t Know how hoddler name the pins :) here you’ll fins the uno schematic arduino.cc/en/uploads/Main/Arduino_Uno_Rev3-schematic.pdf Commented Aug 15, 2018 at 7:09
  • This is the original ATmega pin naming and stands for Port B, pin 1. all the pins are separated into banks (ports) of 8 pins each. For pin functions, refer to the relevant datasheet: ww1.microchip.com/downloads/en/DeviceDoc/… Commented Aug 15, 2018 at 8:54
  • It seems that SCK MOSI and MISO correspond to D1, D2 and D3 (github.com/NicoHood/HoodLoader2/wiki/…) on the 16u2. And yes they are digital « normal ;) » pins Commented Aug 15, 2018 at 12:59