Pin number
Name
Description
4
NC
No Connect
5
VREG
Regulated voltage or VUSB if no regulator present.
6
UART RX
mEDBG UART RX line
7
UART TX
mEDBG UART TX line
8
CLK
mEDBG clock output
9
GND
Ground
10
VUSB
USB voltage
Figure 3-2. Xplained Nano Standard Pin-Out for TPI
RESET
TPI DATA
TPI CLK
NC
VREG
VUSB
GND
CLK OUT
CDC TX
CDC RX
VCC
GND
Micro USB Connector
mEDBG
Power disconnect
Status LED
3.4.
Disconnecting mEDBG
The target controller ATtiny104 can be completely separated from the mEDBG, but this requires some
small modifications to the board using a soldering iron. By removing the resistors in the sections shown in
the figure below, the mEDBG is completely disconnected from the target controller. If desired to connect
the mEDBG again, solder in 0Ω resistors or solder in 100-mil headers on the header footprints and use
wire-straps to connect the interfaces.
Atmel ATtiny104 Xplained Nano [USER GUIDE]
Atmel-42671A-ATtiny104-Xplained-Nano_User Guide-02/2016
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