Atmel SAM C21 Xplained Pro User Manual

Table 4-12 Cortex Debug Connector
Cortex Debug Connector pin Pin / Net Function
1 VCC_TARGET_P3V3_P5V0 ATSAMC21J18A voltage
2 SWDIO SWD data signal
3 GND Ground
4 SWCLK SWD clock signal
5 GND Ground
6 - -
7 - -
8 - -
9 GND Ground
10 RESETN Target reset signal
4.3. Peripherals
4.3.1. LED
There is one yellow LED available on the SAM C21 Xplained Pro board that can be turned on and off.
The LED is activated by driving the connected I/O line to low.
Table 4-13 LED Connection
SAM C21 pin Function Shared functionality
PA15 Yellow LED0 Crystal footprint and EXT3
4.3.2. Mechanical Buttons
SAM C21 Xplained Pro contains two mechanical buttons connected to the SAM C21. One button is the
RESET button connected to the reset line and the other is a generic user configurable button. When a
button is pressed it will drive the I/O line to GND.
Info: There is no pull-up resistor connected to the generic user button. Remember to enable
the internal pull-up in the SAM C21 to use the button.
Table 4-14 Mechanical Buttons
SAM C21 pin Function Shared functionality
RESETN RESET Shield, Shield(2), and EDBG
PA28 SW0 EXT3 and EDBG GPIO3
4.3.3. Crystals
The SAM C21 Xplained Pro kit contains one mounted 32.768kHz crystal and a footprint for higher
frequency crystals that can be used as clock sources for the SAM C21. The crystals have cut-straps next
to them that can be used to measure the oscillator safety factor. This is done by cutting the strap and
Atmel SAM C21 Xplained Pro [USER GUIDE]
Atmel-42460C-SAM C21 Xplained Pro_User Guide-10/2015
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Atmel SAM C21 Xplained Pro Specifications

General

Brand	Atmel
Model	SAM C21 Xplained Pro
Category	Motherboard
Language	English