STLINK-V3MODS Debugger & Programmer STMicroelectronics STLINK-V3MODS Debugger and Programmer is a compact debugging and programming probe for STM32 microcontrollers. The JTAG/SWD interfaces are used to communicate with any STM32 microcontroller located on an application board. The STLINK-V3MODS provides a Virtual COM port interface, enabling the host PC to communicate with the target microcontroller through one UART, and bridge interfaces (SPI, I2C, CAN, GPIOs). This simplifies the field programming through a bootloader. The STLINK-V3MODS is ready to be embedded in a master application and can be directly soldered on the PCB motherboard.