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Atmel Xplained Pro Evaluation Kit for the ATSAMD21J18A Microcontroller ATSAMD21-XPRO ATSAMD21-XPRO Data Sheet

Product codes
ATSAMD21-XPRO
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Atmel SAM D21 Xplained Pro [USER GUIDE]
42220A-MCU-02/2014
13
4.3
Embedded Debugger Implementation
SAM D21 Xplained Pro contains an Embedded Debugger (EDBG) that can be used to program and debug the
ATSAMD21J18A 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 D21
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 4-9. SWD Connections
Pin on SAM D21
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 ATSAMD21J18A UARTs.
For further information on how to use the Virtual COM port see 
Table 4-10. Virtual COM Port Connections
Pin on SAM D21
Function
PA22
SERCOM3 PAD[0] UART TXD (SAM D21 TX line)
PA23
SERCOM3 PAD[1] UART RXD (SAM D21 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 D21 to the host PC. For further information on
how to use the DGI interface see 
Table 4-11. DGI Interface Connections when using SPI
Pin on SAM D21
Function
PB31
SERCOM5 PAD[1] SPI SS (Slave select) (SAM D21 is Master)
PB16
SERCOM5 PAD[0] SPI MISO (Master In, Slave Out)
PB22
SERCOM5 PAD[2] SPI MOSI (Master Out, Slave in)
PB23
SERCOM5 PAD[3] SPI SCK (Clock Out)
Table 4-12. DGI Interface Connections when using I²C
Pin on SAM D21
Function
PA08
SERCOM2 PAD[0] SDA (Data line)
PA09
SERCOM2 PAD[1] SCL (Clock line)
Four GPIO lines are connected to the Embedded Debugger. The EDBG can monitor these lines and time
stamp pin value changes. This makes it possible to accurately time stamp events in the SAM D21 application
.
Table 4-13. GPIO Lines Connected to the EDBG
Pin on SAM D21
Function
PA27
GPIO0
PA28
GPIO1
PA20
GPIO2
PA21
GPIO3