STM8L EnergyLite core and on-chip memory
The STM8L151R6T6: It carries 32 KB of Flash program memory, 2 KB of RAM, and 1 KB of EEPROM — enough for a small control loop or sensor hub firmware image without external storage. The 54 general-purpose I/O lines give this part the pin count to handle parallel displays, keypad matrices, or multiple serial buses without a port expander.
Analog and serial interface complement
An integrated 28-channel 12-bit ADC and dual 12-bit DAC allow the MCU to read analog sensors and output a control voltage directly — useful for a low-speed feedback loop or a set-point generator on a single chip. Connectivity covers I²C, SPI, UART/USART, and IrDA, so it can talk to a radio module, an external EEPROM, or a host controller over a standard serial link.