Connecting to an aWire Target

The aWire interface requires only one data line in addition to VCC and GND. On the target, this line is the nRESET line, although the debugger uses the JTAG TDO line as the data line.

The recommended pinout for the 6-pin aWire connector is shown in Figure 1.

Connection to a 6-pin 100-mil aWire Header

Use the 6-pin 100-mil tap on the flat cable (included in some kits) to connect to a standard 100-mil aWire header.

Connection to a 6-pin 50-mil aWire Header

Use the adapter board (included in some kits) to connect to a standard 50-mil aWire 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 the table below.

Table 1. Atmel-ICE aWire Pin Mapping
Atmel-ICE AVR PORT Pins Target Pins Mini-Squid Pin aWire Pinout
Pin 1 (TCK)   1  
Pin 2 (GND) GND 2 6
Pin 3 (TDO) DATA 3 1
Pin 4 (VTG) VTG 4 2
Pin 5 (TMS)   5  
Pin 6 (nSRST)   6  
Pin 7 (Not connected)   7  
Pin 8 (nTRST)   8  
Pin 9 (TDI)   9  
Pin 10 (GND)   0