STM8S 8-bit MCUs - STMicroelectronics

The STM8S series of mainstream 8-bit microcontrollers cover a large variety of applications in the industrial, consumer, computer and mass market fields. Based on the STM8 proprietary core, the STM8S series benefits from ST's 130 nm technology and advanced core architecture performing up to 20 MIPS at 24 MHz. Embedded EEPROM, RC oscillators, and a full set of standard peripherals provide a robust and reliable solution for designers. The associated tool chain, from affordable discovery kits to more complex evaluation kits and third-party tools, make it easy to develop with STM8S microcontrollers. The STM8S series consists of four lines with differentiated features but full compatibility and upgradability to simplify future design changes.

The Value line, STM8S00, is the entry level series with a basic feature set.
The Access line, STM8S10, offers more features and a bigger variety of packages.
The Performance line, STM8S20, features a full set of peripherals and provides performance for medium to higher-end applications.
The Application specific line, STM8S90, provides more analog features and performance.