ST Nucleo-64 STM32WL3 Series User Manual page 16

7.5.4 Using an external debug tool to program and debug STM32WL33CC
Before connecting any external debug tool to the STDC14 debug connector (CN17), the SWD and VCP signals
from STLINK-V3EC must be isolated. For this, fit the jumper on JP4. It disables the U9 level shifter and isolates
SWD and VCP signals from STLINK-V3EC. The configuration of the JP4 is explained in
Once the jumper is fitted on JP4, an external debug tool can be connected to the STDC14 debug connector
(CN17).
Jumper
JP4
Note: The STDC14 connector supports 1V8 or 3V3 for the target reference voltage. When using the external debug
connector (CN17), STLINK-V3EC can be used to supply the board through the USB Type-C
7.5.5 STLINK-V3EC USB connector (CN15)
The main function of this connector is the access to STLINK-V3EC embedded on NUCLEO-WL33CCx for the
debugging as explained above. It can supply the board (refer to
®
USB Type-C
7.5.6 Level shifters
NUCLEO-WL33CCx features a system for supplying the STM32WL33CC with a voltage different from ST-LINK,
always supplied by a 3V3 source with a dedicated LDO. Level shifters avoid conflict when using a different target
voltage. Level shifters ensure the voltage conversion between ST-LINK and the SoC. It drives SWD and UART
signals connected to ST-LINK.
UM3418 - Rev 1
Definition
Debugger selection
connector.
Table 5. JP4 configuration
Setting
An external debugger connected to the STDC14
ON [1-2] connector (CN17) can be used. The level shifter
(U9) is in high impedance (high-Z).
The embedded STLINK-V3EC is selected (default
OFF
configuration)
Power supply). The connector is a standard
UM3418
Hardware layout and configuration
Table 5.
Comment
®
connector (CN15).
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