Connection to a custom 100-mil header
The 10-pin mini-squid cable should be used to connect between the Atmel-ICE AVR connector port and
the target board. Three connections are required, as described in the table below.
Table 3-4. Atmel-ICE UPDI Pin Mapping
Atmel-ICE AVR port pin Target pins Mini-squid pin Atmel STK600 UPDI pinout
Pin 1 (TCK) 1
Pin 2 (GND) GND 2 6
Pin 3 (TDO) UPDI_DATA 3 1
Pin 4 (VTG) VTG 4 2
Pin 5 (TMS) 5
Pin 6 (nSRST) [/RESET sense] 6 5
Pin 7 (Not connected) 7
Pin 8 (nTRST) 8
Pin 9 (TDI) 9
Pin 10 (GND) 0
3.6. Connecting to a debugWIRE Target
The recommended pinout for the 6-pin debugWIRE (SPI) connector is shown in Table 3-6.
Connection to a 6-pin 100-mil SPI header
Use the 6-pin 100-mil tap on the flat cable (included in some kits) to connect to a standard 100-mil SPI
header.
Connection to a 6-pin 50-mil SPI header
Use the adapter board (included in some kits) to connect to a standard 50-mil SPI header.
Connection to a custom 100-mil header
The 10-pin mini-squid cable should be used to connect between the Atmel-ICE AVR connector port and
the target board. Three connections are required, as described in Table 3-5.
Although the debugWIRE interface only requires one signal line (RESET), V
CC
and GND to operate
correctly, it is advised to have access to the full SPI connector so that the debugWIRE interface can be
enabled and disabled using SPI programming.
When the DWEN fuse is enabled the SPI interface is overridden internally in order for the OCD module to
have control over the RESET pin. The debugWIRE OCD is capable of disabling itself temporarily (using
the button on the debugging tab in the properties dialog in Atmel Studio), thus releasing control of the
RESET line. The SPI interface is then available again (only if the SPIEN fuse is programmed), allowing
the DWEN fuse to be un-programmed using the SPI interface. If power is toggled before the DWEN fuse
is un-programmed, the debugWIRE module will again take control of the RESET pin.
Note:
It is highly advised to simply let Atmel Studio handle setting and clearing of the DWEN fuse.
Atmel Atmel-ICE [USER GUIDE]
Atmel-42330C-Atmel-ICE_User Guide-10/2016
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