Atmel Xplained Pro Evaluation Kit for the ATSAMD21J18A Microcontroller ATSAMD21-XPRO ATSAMD21-XPRO Data Sheet
Product codes
ATSAMD21-XPRO
986
Atmel | SMART SAM D21 [DATASHEET]
Atmel-42181C–SAM-D21_Datasheet–07/2014
38.7.3 20-pin IDC JTAG Connector
For debuggers and/or programmers that support the 20-pin IDC JTAG Connector, e.g. the SAM-ICE, the signals should
be connected as shown in
be connected as shown in
Figure 38-12.20-pin IDC JTAG Connector
Table 38-11. 20-pin IDC JTAG Connector
Header Signal Name
Description
SWDCLK
Serial wire clock pin
SWDIO
Serial wire bidirectional data pin
nRESET
Target device reset pin, active low
VCC
Target voltage sense, should be connected to the device V
DD
GND
Ground
GND*
These pins are reserved for firmware extension purposes. They can be left open or connected to
GND in normal debug environment. They are not essential for SWD in general.
GND in normal debug environment. They are not essential for SWD in general.
1
VCC
NC
NC
SWDIO
SWDCLK
NC
NC
nRESET
NC
NC
NC
GND
GND
GND
GND
GND
GND*
GND*
GND*
GND*
20-pin IDC JTAG Connector
GND
SWDIO
SWCLK
RESET
V
DD