SAMC21 datasheet(20/46 Pages) ATMEL

20 / 46 page

Table 4-12. Cortex Debug Connector

Cortex Debug Connector pin

Pin / Net

Function

VCC_TARGET_P3V3_P5V0

ATSAMC21J18A voltage

SWDIO

SWD data signal

GND

Ground

SWCLK

SWD clock signal

GND

Ground

GND

Ground

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-42460D-SAM-C21-Xplained-Pro_User Guide-08/2016

SAMC21 Arkusz danych(PDF) 20 Page - ATMEL Corporation

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