Mini Embedded Debugger

The ATtiny416 Xplained Nano contains the Mini Embedded Debugger (mEDBG) for on-board programming and debugging. 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 and debug the ATtiny416. On ATtiny416 Xplained Nano, the UPDI interface is connected between the mEDBG and the ATtiny416.

The Virtual COM Port is connected to a UART on the ATtiny416 and provides an easy way to communicate with the target application through the terminal software. It offers variable baud rate, parity, and stop bit settings.
Note: The settings on the ATtiny416 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 ATtiny416. If the DTR signal is not enabled the UART pins on the mEDBG are kept in high-z (tri-state) rendering the COM port unusable. The DTR signal is automatically set by some terminal software, but it may have to be manually enabled in your terminal.

The mEDBG controls one status LED on the ATtiny416 Xplained Nano. The table below shows how the LED is controlled in different operation modes.

Table 1. mEDBG LED Control
Operation mode Status LED
Power up LED is briefly lit
Normal operation LED is not lit
Programming Activity indicator; the LED flashes when programming/debugging with the mEDBG