7.4
Disconnecting the On-Board Debugger
The on-board debugger and level shifters can be completely disconnected from the ATmega4809.
The block diagram below shows all connections between the debugger and the ATmega4809. The rounded boxes
represent connections to the board edge. The signal names shown are also printed in silkscreen on the bottom side
of the board.
To disconnect the debugger, cut the straps shown in
.
Attention:
Cutting the GPIO straps to the on-board debugger will disable the virtual serial port,
programming, debugging, and data streaming. Cutting the power supply strap will disconnect the on-board
power supply.
Tip:
Any connection that is cut can be reconnected using solder. Alternatively, a 0Ω 0402 resistor can be
mounted.
Tip:
When the debugger is disconnected, an external debugger can be connected to holes shown in
. Details about connecting an external debugger are described in
.
Figure 7-5. On-Board Debugger Connections Block Diagram
D
E
B
U
G
G
E
R
TARGET
Level-Shift
PA04/PA06
PA07
PA08
PA16
PA00
PA01
USB
DIR x 5
VCC_P3V3
VBUS
V
CC_LEVEL
V
CC_T
AR
GE
T
DBG0
DBG1
DBG2
DBG3
CDC TX
CDC RX
CDC RX
CDC TX
DBG3
DBG2
DBG1
DBG0
GPIO straps
LDO
VOFF
LDO
VBUS
VTG
VCC_EDGE
Power Supply strap
Target Power strap
UART RX
UART TX
ATmega4809 Curiosity Nano
Appendix
©
2020 Microchip Technology Inc.
User Guide
DS50002804B-page 35
