Data Sheet

1017
Atmel | SMART SAM D21 [DATASHEET]
Atmel-42181G–SAM-D21_Datasheet–09/2015
38.7.2 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. Figure 38-11 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 Figure 38-11 with details given in Table 38-10 to connect to the target using the
JTAGICE3 50 mil cable directly.
Figure 38-11.10-pin JTAGICE3 Compatible Serial Wire Debug Interface
Table 38-10. 10-pin JTAGICE3 Compatible Serial Wire Debug Interface
Header Signal Name Description
SWDCLK Serial wire clock pin
SWDIO Serial wire bidirectional data pin
RESET Target device reset pin, active low
VTG Target voltage sense, should be connected to the device V
DD
GND Ground
VTG
GND
NC
NC
SWDIO
SWDCLK
NC
NC
RESET
10-pin JTAGICE3 Compatible
Serial Wire Debug Header
GND
SWDIO
SWCLK
RESET
V
DD
1
NC