STM8S105K4T6 Development Board Module STM8 Mini System Board MCU Core Board Learning Board 3.3V 16MHz Product Features: STM8 development board uses STM8S105K4T6, LQFP-32 main control chip, 8-bit CPU, 16MHz operating frequency. The on-board 3.3V LDO low-dropout regulator chip, powered by MicroUSB, leads to the SWIM single-line program download and debug interface.   Schematic: