8-bit MCU with 16 MHz core and industrial temperature range
The STMicroelectronics STM8S103F3M3 is an 8-bit microcontroller from the STM8S family, built around the STM8 core and clocked at 16 MHz.
Memory budget and peripheral fit
With 8 KB of Flash and 1 KB of RAM, the firmware image needs to be lean — think bootloader plus one application task rather than a full RTOS. The 640-byte EEPROM is useful for calibration constants or fault logs that survive a power cycle. The 16 available I/O lines (20-SOIC package) and the 5-channel 10-bit ADC cover most sensor-read and switch-debounce tasks without a port expander.