6.2.2 Auxiliary (AUX) Physical (including JTAG)

When debugging Atmel AVR target devices that feature an auxiliary port, it is recommended to use the 38-pin connector, which provides access to both JTAG and AUX ports. The AUX port facilitates advanced debugging features such as program trace.

The pinout of the 38-pin connector is shown in Figure 6-4 and listed in Table 6-2.

The Mictor Connector is available from Tyco Electronics (part number 2-5767004-2).

Figure 6-4. Mictor Connector Pinout
Table 6-2. Mictor Connector Pinout
NamePinDescription
TCK15Test Clock
TMS17Test Mode Select
TDI19Test Data In
TDO11Test Data Out
nTRST21Test Reset
nRESET9Source Reset
EVTI10Event In
EVTO32Event Out
MCKO34Message Clock Out
MSEO038Message Start/End Out [0]
MSEO136Message Start/End Out [1]
MDO030Message Data Out [0]
MDO128Message Data Out [1]
MDO226Message Data Out [2]
MDO324Message Data Out [3]
MDO422Message Data Out [4]
MDO520Message Data Out [5]
VREF12Target Voltage Reference
GND39-43Ground