24 MHz 8-bit core with CAN 2.0B — the industrial sweet spot
The STM8S208C6T6 is an 8-bit microcontroller from STMicroelectronics' STM8S family, built around the STM8 core running at 24 MHz. The internal oscillator trims the bill of materials by one external crystal for many applications. On the peripheral side, it carries a CAN 2.0B controller, two I²C, two SPI, and three UART interfaces (one with LIN and IrDA support), plus a 10-channel 10-bit ADC.
32 KB Flash, 6 KB RAM, 2 KB EEPROM — sizing the firmware budget
The 32 KB Flash accommodates a modest application stack — bootloader, main control loop, and CANopen or Modbus protocol layer — with room for field updates if the bootloader supports it. The 2 KB EEPROM is useful for calibration constants, node ID, or fault logs without wearing the Flash. 6 KB of SRAM is the working memory ceiling; a design with large lookup tables or deep FIFO buffers should budget carefully. For typical sensor-to-CAN gateway or motor-control logic, it is adequate.
38 I/O and the 48-LQFP footprint
The 48-LQFP package (7x7 mm body, 0.5 mm pitch) gives 38 general-purpose I/O lines, enough for a keypad matrix, a few status LEDs, and the CAN transceiver plus UART debug header. The surface-mount profile is standard for reflow assembly;.