Datasheet

42.7.1 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 the figure below with details described in the next table.
Figure 42-11. Cortex Debug Connector (10-pin)
1
VTref
GND
GND
NC
NC
SWDIO
SWDCLK
NC
NC
nRESET
Cortex Debug Connector
(10-pin)
GND
SWDIO
SWCLK
RESET
V
DD
Table 42-10. Cortex Debug Connector (10-pin)
Header Signal
Name
Description Recommended Pin
Connection
SWDCLK Serial wire clock pin Pull-up resistor 1kΩ
SWDIO Serial wire bidirectional data pin
RESET Target device reset pin, active low
Refer to 42.4 External Reset Circuit.
VTref Target voltage sense, should be connected to the
device V
DD
GND Ground
42.7.2 10-pin JTAGICE3 Compatible Serial Wire Debug Interface
The JTAGICE3 debugger and programmer does not support the Cortex Debug Connector (10-pin)
directly, hence a special pinout is needed to directly connect the SAM D21 to the JTAGICE3, alternatively
one can use the JTAGICE3 squid cable and manually match the signals between the JTAGICE3 and
SAM D21. The following figure describes how to connect a 10-pin header that support connecting the
JTAGICE3 directly to the SAM D21 without the need for a squid cable.
To connect the JTAGICE3 programmer and debugger to the SAM D21, one can either use the JTAGICE3
squid cable, or use a 10-pin connector as shown in the figure below with details given in the next table to
connect to the target using the JTAGICE3 50 mil cable directly.
SAM D21 Family
Schematic Checklist
© 2018 Microchip Technology Inc.
Datasheet Complete
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