Curiosity Nano Standard Pinout - Microchip Technology ATmega4809 Curiosity Nano User Manual

3.1.2.2 Configuration Words/Fuse Bytes
Fuse Bytes (AVR
The debugger does not mask any fuse bits or combinations when writing fuses. It is not possible to
disable UPDI by fuse setting on devices with a dedicated UPDI pin. For devices with a shared/
configurable UPDI pin, be sure not to select an alternate pin function for UPDI either by fuse setting in
Programming mode or by using the I/O view or memory views to modify the memory-mapped fuse
values. Disabling UPDI will render the debugger unable to contact the target device — an external
programmer capable of 12V UPDI activation will be required.
3.2

Curiosity Nano Standard Pinout

The twelve edge connections closest to the USB connector on Curiosity Nano kits have a standardized
pinout. The program/debug pins have different functions depending on the target programming interface
as shown in the table and figure below.
Table 3-2. Curiosity Nano Standard Pinout
Debugger Signal
ID
CDC TX
CDC RX
DBG0
DBG1
DBG2
DBG3
NC
VBUS
VOFF
VTG
GND
Figure 3-1. Curiosity Nano Standard Pinout
©
2018 Microchip Technology Inc.
®
Targets)
UPDI Target
-
UART RX
UART TX
UPDI
GPIO1
GPIO0
RESET
-
-
-
-
-
NC
ID
CDC RX
CDC TX
DBG1
DBG2
ATmega4809 Curiosity Nano
Description
ID line for extensions.
USB CDC TX line.
USB CDC RX line.
Debug data line.
Debug clock line/DGI GPIO
DGI GPIO
Reset line.
No connect.
VBUS voltage for external use.
Voltage Off input.
Target voltage.
Common ground.
USB
PS LED
DEBUGGER
CURIOSITY NANO
User Guide
Curiosity Nano
VBUS
VOFF
DBG3
DBG0
GND
VTG
DS50002804A-page 9