16 MHz 8-bit STM8 core for low-power sensor and control endpoints
The STMicroelectronics STM8L101G3U6TR is an 8-bit microcontroller from the STM8L EnergyLite family, built around an STM8 core clocked at 16 MHz.
Memory budget and serial interfaces
With 8 KB of Flash and 1.5 KB of SRAM, firmware size is the primary constraint — expect to fit a modest state machine, a few sensor calibration tables, and a UART or I²C driver. The 2 KB EEPROM is useful for storing configuration parameters or calibration constants that survive power cycles without wearing the Flash.
Package and footprint for space-constrained boards
The 26 I/O lines provide enough headroom for a keypad matrix, a few LEDs, and the serial bus, leaving a handful of pins for interrupts or ADC inputs. Surface-mount assembly is straightforward with standard reflow profiles for the UFQFPN land pattern.