Peripheral Allocation

• CAN0: Expansion
  • PA22 (TX), PA23 (RX)
    
• SERCOM0: I2C, front panel/rear IO (through mux)
  • IOSET1 
  • PA8 (SDA, PAD0), PA9 (SCL, PAD1)
• SERCOM2: I²C, analog board 
  • PA12 (SDA, PAD0), PA13 (SCL, PAD1)
• SERCOM3: SPI, analog board
  • IOSET1
  • PA16 (SCK, PAD1), PA17 (MOSI, PAD0), PA18 (MISO, PAD2)
  • Chip select: PA19 (/EN)
  • Chip index: PB16, PB17
• SERCOM4: SPI, front panel display
  • IOSET1
  • DIPO = 0x0
  • DOPO = 0x2
  • PB12 (MISO, PAD0), PB13 (SCK, PAD1), PB14 (/CS, PAD2), PB15 (MOSI, PAD3)
• SERCOM5: SPI, NOR flash (bonus data)
  • IOSET6
    
  • DIPO = 0x3
  • DOPO = 0x0
  • PB2 (MOSI, PAD0), PB3 (SCK, PAD1), PB0 (/CS, PAD2), PB1 (MISO, PAD3)
• TC3: Fan PWM
  • PA14: WO[0]
• TC5: Beeper
  • PB10: WO[0]
• EIC: External interrupt controller
  • PA15: /TRIGGER
    • EXTINT15
  • PA20: /ANALOG_IRQ
    • EXTINT4
  • PB08: ENCODER_B
    • EXTINT8
  • PB07: ENCODER_A
    • EXTINT7
  • PA10: /IO_I2C_IRQ
    • EXTINT10
• XOSC1: 12MHz oscillator
  • XIN (PB22), XOUT (PB23)
• Debug
  • SWCLK (PA30), SWDIO (PA31), SWO (PB30)

If desired, the driver communication interface can use CAN0 instead. It uses the same IO pins as the I²C bus, and requires a CAN transceiver on the board.