Pin on J804 SAM C21 pin Arduino pin name Function Shared functionality
7 PB30 D6 TCC0_W0 EXT2
8 PB04 D7 GPIO EXT3
Table 4-7 J801 - Digital High
Pin on J801 SAM C21 pin Arduino pin name Function Shared functionality
1 PB05 D8 GPIO EXT3
2 PB31 D9 TCC0_W1 EXT2
3 PA27 D10 / SPI-SS GPIO EXT3
4 PB00 D11 / SPI-MOSI SERCOM5 PAD2 EXT2, EXT3, EDBG SPI, and
Shield
5 PB02 D12 / SPI-MISO SERCOM5 PAD0 EXT2, EXT3, EDBG SPI, and
Shield
6 PB01 D13 / SPI-SCK SERCOM5 PAD3 EXT2, EXT3, EDBG SPI, and
Shield
7 - GND - -
8 PA03 AREF ADC / DAC VREFA
9 PA12 SDA SERCOM2 PAD0 EXT1, EXT2, EXT3, Crypto, and
EDBG I2C
10 PA13 SCL SERCOM2 PAD1 EXT1, EXT2, EXT3, Crypto, and
EDBG I2C
Table 4-8 J800 - SPI
Pin on
J800
SAM C21 pin Arduino pin
name
Function Shared functionality
1 PB02 MISO SERCOM5 PAD0 EXT2, EXT3, EDBG SPI,
and Shield
2 - 5V VCC_TARGET_P3V3_P5V0 -
3 PB01 SCK SERCOM5 PAD3 EXT2, EXT3, EDBG SPI,
and Shield
4 PB00 MOSI SERCOM5 PAD2 EXT2, EXT3, EDBG SPI,
and Shield
5 RESETN RESET TARGET_RESET -
6 - GND GND -
4.2.3. VCC Selection Header
The SAM C21 Xplained Pro has a 3-pin header labeled VCC_SEL on the board. This header can be used
to select between 3.3V and 5.0V as the supply voltage for the ATSAMC21J18A, peripherals, and
extension headers by placing a jumper on pin 1-2 or pin 2-3. Selecting 5.0V will supply the kit directly
from the USB or an external 5.0V source. Selecting 3.3V will supply the kit from an on-board regulator.
Atmel SAM C21 Xplained Pro [USER GUIDE]
Atmel-42460C-SAM C21 Xplained Pro_User Guide-10/2015
17
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