SAMC21 datasheet(31/46 Pages) ATMEL

31 / 46 page

4.5.1.

Serial Wire Debug

The Serial Wire Debug (SWD) use two pins to communicate with the target. For further information on

how to use the programming and debugging capabilities of the EDBG, see Embedded Debugger.

Table 4-27. SWD Connections

SAM C21 pin

Function

PA30

SWD clock

PA31

SWD data

4.5.2.

Virtual COM Port

The Embedded Debugger acts as a Virtual Com Port gateway by using one of the ATSAMC21J18A

UARTs. For further information on how to use the Virtual COM port, see Embedded Debugger.

Table 4-28. Virtual COM Port Connections

SAM C21 pin

Function

Shared functionality

PB10

SERCOM4 PAD[2] UART TXD (SAM C21 TX line)

PB11

SERCOM4 PAD[3] UART RXD (SAM C21 RX line) -

4.5.3.

Atmel Data Gateway Interface

The Embedded Debugger features an Atmel Data Gateway Interface (DGI) by using either an SPI or I²C.

The DGI can be used to send a variety of data from the ATSAMC21J18A to the host PC. For further

information on how to use the DGI interface, see Atmel Data Visualizer and the EDBG User Guide.

Table 4-29. DGI Interface Connections when using SPI

SAM C21 pin

Function

Shared functionality

PB23

GPIO/SPI SS (Slave select) (SAM C21 is Master)

PB02

SERCOM5 PAD[0] SPI MISO (Master In, Slave

Out)

EXT2, EXT3, Shield,

and Shield(2)

PB00

SERCOM5 PAD[2] SPI MOSI (Master Out, Slave

In)

EXT2, EXT3, Shield,

and Shield(2)

PB01

SERCOM5 PAD[3] SPI SCK (Clock Out)

EXT2, EXT3, Shield,

and Shield(2)

Table 4-30. DGI Interface Connections when using I²C

SAM C21 pin

Function

Shared functionality

PA12

SERCOM2 PAD[0] SDA (Data line)

EXT1, EXT2, EXT3,

Shield, and Crypto

Footprints

PA13

SERCOM2 PAD[1] SCL (Clock line)

EXT1, EXT2, EXT3,

Shield, and Crypto

Footprints

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 C21

Atmel SAM C21 Xplained Pro [USER GUIDE]

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

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