Atmel Xplained Pro Evaluation Kit ATSAMD20-XPRO ATSAMD20-XPRO Data Sheet
Product codes
ATSAMD20-XPRO
Atmel SAM D20 Xplained Pro [USER GUIDE]
42102C-MCU-02/2014
11
Table 4-4. External 32.768kHz Crystal
Pin on SAM D20
Function
PA00
XIN32
PA01
XOUT32
4.2.2
Mechanical Buttons
SAM D20 Xplained Pro contains two mechanical buttons. One button is the RESET button connected to the
SAM D20 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.
Table 4-5. Mechanical Buttons
Pin on SAM D20
Silkscreen text
RESETN
RESET
PA15
SW0
4.2.3
LED
There is one yellow LED available on the SAM D20 Xplained Pro board that can be turned on and off. The LED
can be activated by driving the connected I/O line to GND.
Table 4-6. LED connections
Pin on SAM D20
LED
PA14
Yellow LED0
4.3
Embedded Debugger Implementation
SAM D20 Xplained Pro contains an Embedded Debugger (EDBG) that can be used to program and debug the
ATSAMD20J18A using Serial Wire Debug (SWD). The Embedded Debugger also include a Virtual Com port
interface over UART, an Atmel Data Gateway Interface over SPI and TWI and it monitors four of the SAM D20
GPIOs. Atmel Studio can be used as a front end for the Embedded Debugger.
4.3.1
Serial Wire Debug
The Serial Wire Debug (SWD) use two pins to communicate with the target. For further information on how to
Table 4-7. SWD Connections
Pin on SAM D20
Function
PA30
SWD clock
PA31
SWD data
4.3.2
Virtual COM Port
The Embedded Debugger acts as a Virtual Com Port gateway by using one of the ATSAMD20J18A UARTs.
For further information on how to use the Virtual COM port see
Table 4-8. Virtual COM Port Connections
Pin on SAM D20
Function
PA24
SERCOM3 PAD[2] UART TXD (SAM D20 TX line)
PA25
SERCOM3 PAD[3] UART RXD (SAM D20 RX line)
4.3.3
Atmel Data Gateway Interface
The Embedded Debugger features an Atmel Data Gateway Interface (DGI) by using either a SPI or I²C port.
The DGI can be used to send a variety of data from the SAM D20 to the host PC. For further information on
how to use the DGI interface see
Table 4-9. DGI Interface Connections when using SPI
Pin on SAM D20
Function
PB31
SERCOM5 PAD[1] SPI SS (Slave select) (SAM D20 is Master)