Use Nucleo “cuttable” ST-LINK as stand-alone VCP AN4989
106/118 AN4989 Rev 3
Appendix B Use Nucleo “cuttable” ST-LINK as stand-
alone VCP
As stated in Section 7.2: Printf via UART on page 69, it is required to have an adapter
between MCU and PC to setup a proper serial connection.
Design constraints may prevent to use the default UART connected to VCP, or may require
another serial connection with the PC.
In such a case, it is simpler and cheaper to use another Nucleo board instead of getting the
appropriate RS232 level shifter.
The "Cuttable PCB" capabilities of the Nucleo-64 and Nucleo-144 boards represent their
capacity to disconnect on-board ST-LINK from STM32 application part.
The simple way to disconnect the ST-LINK part from the MCU application part is to power off
the MCU by removing jumper J5. This is indicated by the fact that LED LD3 is off when a
USB cable is connected. This configuration is presented in As show in
Figure 81.
Figure 81. ST-LINK cuttable part of Nucleo
In this case the ST-LINK part can be used as a stand-alone module.
1. As debugger interface to program and debug an external application as documented in
the user manual
– STM32 Nucleo-144 board: section 6.3.4 of Using ST-LINK/V2-1 to program and
debug an external STM32 application (UM1974)
– STM32 Nucleo-64 board: Using ST-LINK/V2-1 to program and debug an external
STM32 application (UM1724)
2. As an alternative and/or additional Virtual COM port
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