ST STM8S103F3 Breakout Board


Platform ST STM8: The STM8 is an 8-bit microcontroller family by STMicroelectronics an extended variant of the ST7 microcontroller architecture. STM8 microcontrollers are particularly low cost for a full-featured 8-bit microcontroller.

Microcontroller STM8S103F3P6
Frequency 16MHz
Flash 8KB
Vendor ST


Please use stm8sblue ID for board option in “platformio.ini” (Project Configuration File):

platform = ststm8
board = stm8sblue

You can override default ST STM8S103F3 Breakout Board settings per build environment using board_*** option, where *** is a JSON object path from board manifest stm8sblue.json. For example, board_build.mcu, board_build.f_cpu, etc.

platform = ststm8
board = stm8sblue

; change microcontroller
board_build.mcu = stm8s103f3p6

; change MCU frequency
board_build.f_cpu = 16000000L


ST STM8S103F3 Breakout Board supports the next uploading protocols:

  • serial
  • stlinkv2

Default protocol is serial

You can change upload protocol using upload_protocol option:

platform = ststm8
board = stm8sblue

upload_protocol = serial


Debugging - “1-click” solution for debugging with a zero configuration.


You will need to install debug tool drivers depending on your system. Please click on compatible debug tool below for the further instructions and configuration information.

You can switch between debugging Tools & Debug Probes using debug_tool option in “platformio.ini” (Project Configuration File).

ST STM8S103F3 Breakout Board does not have on-board debug probe and IS NOT READY for debugging. You will need to use/buy one of external probe listed below.

Compatible Tools On-board Default


Name Description
Arduino Arduino Wiring-based Framework allows writing cross-platform software to control devices attached to a wide range of Arduino boards to create all kinds of creative coding, interactive objects, spaces or physical experiences
Standard Peripheral Library The ST Standard Peripheral Library provides a set of functions for handling the peripherals on the STM32 family of microcontrollers.