3.
Curiosity Nano
Curiosity Nano is an evaluation platform of small boards with access to most of the microcontrollers I/Os. The
platform consists of a series of low pin count microcontroller (MCU) boards with on-board debuggers, which are
integrated with MPLAB
®
X IDE and Atmel Studio 7. Each board is identified in the IDE. When plugged in, a Kit
Window is displayed with links to key documentation, including relevant user guides, application notes, data sheets,
and example code. Everything is easy to find. The on-board debugger features a virtual serial port (CDC) for serial
communication to a host PC and a Data Gateway Interface (DGI) with debug GPIO pin(s).
3.1
On-Board Debugger Overview
ATmega4809 Curiosity Nano contains an on-board debugger for programming and debugging. The on-board
debugger is a composite USB device consisting of several interfaces:
• A debugger that can program and debug the ATmega4809 in both MPLAB
®
X IDE and Atmel Studio 7
• A mass storage device that allows drag-and-drop programming of the ATmega4809
• A virtual serial port (CDC) that is connected to a Universal Asynchronous Receiver/Transmitter (UART) on the
ATmega4809, and provides an easy way to communicate with the target application through terminal software
• A Data Gateway Interface (DGI) for code instrumentation with logic analyzer channels (debug GPIO) to visualize
program flow
The on-board debugger controls a Power and Status LED (marked PS) on the ATmega4809 Curiosity Nano board.
The table below shows how the LED is controlled in different operation modes.
Table 3-1. On-Board Debugger LED Control
Operation Mode
Power and Status LED
Boot Loader mode
The LED blinks slowly during power-up
Power-up
The LED is ON
Normal operation
The LED is ON
Programming
Activity indicator: The LED blinks slowly during programming/debugging
Drag-and-drop
programming
Success:
The LED blinks slowly for 2 sec.
Failure:
The LED blinks rapidly for 2 sec.
Fault
The LED blinks rapidly if a power fault is detected
Sleep/Off
The LED is OFF. The on-board debugger is either in a sleep mode or powered down.
This can occur if the board is externally powered.
Info:
Slow blinking is approximately 1 Hz, and rapid blinking is approximately 5 Hz.
3.1.1
Debugger
The on-board debugger on the ATmega4809 Curiosity Nano board appears as a Human Interface Device (HID) on
the host computer’s USB subsystem. The debugger supports full-featured programming and debugging of the
ATmega4809 using both MPLAB
®
X IDE and Atmel Studio 7, as well as some third-party IDEs.
ATmega4809 Curiosity Nano
Curiosity Nano
©
2020 Microchip Technology Inc.
User Guide
DS50002804B-page 7
