Atmel-ICE AVR port pins Target pins Mini-squid pin TPI pinout
Pin 6 (nSRST) /RESET 6 5
Pin 7 (not connected) 7
Pin 8 (nTRST) 8
Pin 9 (TDI) 9
Pin 10 (GND) 0
3.9. Connecting to an SWD Target
The ARM SWD interface is a subset of the JTAG interface, making use of the TCK and TMS pins, which
means that when connecting to an SWD device, the 10-pin JTAG connector can technically be used. The
ARM JTAG and AVR JTAG connectors are, however, not pin-compatible, so this depends upon the layout
of the target board in use. When using an STK600 or a board making use of the AVR JTAG pinout, the
AVR connector port on the Atmel-ICE must be used. When connecting to a board, which makes use of
the ARM JTAG pinout, the SAM connector port on the Atmel-ICE must be used.
The recommended pinout for the 10-pin Cortex Debug connector is shown in Figure 4-4.
Connection to a 10-pin 50-mil Cortex header
Use the flat cable (included in some kits) to connect to a standard 50-mil Cortex header.
Connection to a 10-pin 100-mil Cortex-layout header
Use the adapter board (included in some kits) to connect to a 100-mil Cortex-pinout header.
Connection to a 20-pin 100-mil SAM header
Use the adapter board (included in some kits) to connect to a 20-pin 100-mil SAM header.
Connection to a custom 100-mil header
The 10-pin mini-squid cable should be used to connect between the Atmel-ICE AVR or SAM connector
port and the target board. Six connections are required, as described in the table below.
Table 3-8. Atmel-ICE SWD Pin Mapping
Name AVR
port
pin
SAM
port
pin
Description
SWDC
LK
1 4 Serial Wire Debug Clock.
SWDIO 5 2 Serial Wire Debug Data Input/Output.
SWO 3 6 Serial Wire Output (optional- not implemented on all devices).
nSRST 6 10 Reset.
VTG 4 1 Target voltage reference.
GND 2, 10 3, 5, 9 Ground.
Atmel Atmel-ICE [USER GUIDE]
Atmel-42330C-Atmel-ICE_User Guide-10/2016
22
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