Data Sheet

1015
Atmel | SMART SAM D21 [DATASHEET]
Atmel-42181G–SAM-D21_Datasheet–09/2015
38.7 Programming and Debug Ports
For programming and/or debugging the SAM D21 the device should be connected using the Serial Wire Debug (SWD)
interface. Currently, the SWD interface is supported by several Atmel and third party programmers and debuggers, such
as the SAM-ICE, JTAGICE3 or SAM D21 Xplained Pro (SAM D21 evaluation kit) Embedded Debugger.
Refer to the SAM-ICE, JTAGICE3 or SAM D21 Xplained Pro user guides for details on debugging and programming
connections and options. For connecting to any other programming or debugging tool, refer to that specific programmer’s
or debugger’s user guide.
The SAM D21 Xplained Pro evaluation board for the SAM D21 supports programming and debugging through the
onboard embedded debugger so no external programmer or debugger is needed.
38.7.1 Cortex Debug Connector (10-pin)
For debuggers and/or programmers that support the Cortex Debug Connector (10-pin) interface the signals should be
connected as shown in Figure 38-10 with details described in Table 38-9.
Figure 38-10.Cortex Debug Connector (10-pin)
Table 38-9. Cortex Debug Connector (10-pin)
Table 38-8. Equivalent Internal Pin Capacitance
Symbol Value Description
C
XIN32
3.05pF Equivalent internal pin capacitance
C
XOUT32
3.29pF Equivalent internal pin capacitance
Header Signal Name Description Recommended Pin Connection
SWDCLK Serial wire clock pin Pull-up resistor 10kΩ
SWDIO Serial wire bidirectional data pin
RESET Refer to “External Reset Circuit” on page 1011
1
Cortex Debug Connector
(10-pin)
V
DD
VTref
GND
GND
NC
NC
NC
NC
SWDCLK
SWDIO
RESET
RESET
SWDIO
SWCLK
GND