3.
Xplained Nano
Xplained Nano is an evaluation platform that provides a set of small boards with access to all
microcontoller I/O's. The platform consists of a series of low pin-count Microcontroller (MCU) boards,
which are integrated with Atmel Studio to present relevant user guides, application notes, datasheets, and
example code through Atmel Studio. The platform also features a Virtual COM port for serial
communication to a host PC.
3.1.
Mini Embedded Debugger
The ATtiny104 Xplained Nano contains the Atmel Mini Embedded Debugger (mEDBG) for on-board
programming. The mEDBG is a composite USB device of two interfaces; a debugger and a Virtual COM
Port.
Together with Atmel Studio, the mEDBG debugger interface can program the ATtiny104. On ATtiny104
Xplained Nano, the TPI interface is connected between the mEDBG and the ATtiny104.
The Virtual COM Port is connected to a UART on the ATtiny104 and provides an easy way to
communicate with the target application through terminal software. It offers variable baud rate, parity, and
stop bit settings.
Note:
The settings on the ATtiny104 must match the settings given in the terminal software.
Info:
The virtual COM port in the mEDBG requires the terminal software to set the data
terminal ready (DTR) signal to enable the UART pins connected to the ATtiny104. If the DTR
signal is not enabled the UART pins on the mEDBG is kept in high-z (tristate) rendering the
COM port unusable. The DTR signal is set automatically by some terminal software, but it may
have to be manually enabled in your terminal.
The mEDBG controls one status LED on ATtiny104 Xplained Nano. The table below shows how the LED
is controlled in different operation modes.
Table 3-1. mEDBG LED Control
Operation mode
Status LED
Power up
LED is lit briefly
Normal operation
LED is not lit
Programming
Activity indicator; LED flashes when programming/
debugging with the mEDBG
3.1.1.
Xplained Nano Clock Output
The mEDBG output its CPU clock to the
CLK
Xplained Nano Standard Pin-Out
6. The clock output can be used to feed the target device with a more accurate clock if this is needed
for the application.
3.2.
Power Sources
The ATtiny104 Xplained Nano kit can be powered by different sources. By default the kit will have a 5V
supply and the voltage is taken directly from the USB port through a 500mA PTC fuse. The voltage from
the USB connector can vary between 4.4V to 5.25V (according to USB spec).
Atmel ATtiny104 Xplained Nano [USER GUIDE]
Atmel-42671A-ATtiny104-Xplained-Nano_User Guide-02/2016
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