STMicroelectronics STM8/128-SK/RAIS

Overview

STM8/128-SK/RAIS from Raisonance is a complete, low-cost starter kit for STM8 microcontrollers, centered on the REva evaluation platform with embedded RLink USB debugger/programmer, STM8S208RB (LQFP64) daughterboard, and Ride7 IDE. It supports in-circuit debugging via SWIM, provides 1.8 V/3.3 V/5 V VDD selection, and includes on-board I²C EEPROM, RS-232 interface, analog sensors, and prototyping area - used for rapid firmware development and peripheral validation of STM8-based control systems.

For engineers reviewing the STM8/128-SK/RAIS datasheet, STM8/128-SK/RAIS pinout, STM8/128-SK/RAIS application, or STM8/128-SK/RAIS equivalent, this kit delivers verified hardware-software integration for STM8S208RB-based designs, including SWIM debug connectivity, multi-voltage MCU support, and out-of-box Ride7 project setup with SIMICE simulation and CodeCompressor optimization.

Technical Context

The STM8/128-SK/RAIS integrates the REva motherboard - a universal evaluation platform powered solely via USB - with an interchangeable STM8S208RB LQFP64 daughterboard. It implements ST's SWIM (Single Wire Interface Module) protocol for programming and real-time debugging, and features configurable clock source selection (internal RC or external crystal) and oscillator footprint.

Hardware interfaces include dual DB9 RS-232 ports, I²C bus with EEPROM, analog input via potentiometer and temperature sensor, digital I/O with LEDs/buttons/switches, and a dedicated prototype area. The RLink subsystem handles host PC communication over USB 2.0 Full-Speed and manages target voltage regulation across 1.8 V, 3.3 V, and 5 V logic domains.

Key Specifications

Availability

STM8/128-SK/RAIS is available at Aetrix Electronics and suitable for industrial motor control prototyping, appliance HMI development, and educational embedded systems labs requiring stable component supply and long-term toolchain continuity.

Supply support for STM8/128-SK/RAIS includes scheduled delivery planning, volume procurement assistance, BOM continuity management, traceable sourcing, and lifecycle availability coordination for OEM customers, industrial embedded developers, connected-device designers, and electronics production programs.

Manufacturer

Raisonance is a French embedded tools developer specializing in MCU evaluation platforms, debug probes, and integrated development environments for STMicroelectronics, Silicon Labs, and other semiconductor vendors.

This kit belongs to the REva product line - designed explicitly to unify hardware evaluation and software development for 8-bit MCUs across STM8 and ST7 families using modular daughterboards and USB-native debugging.

FAQ

Does STM8/128-SK/RAIS support STM8L ultra-low-power devices?

No. The STM8/128-SK/RAIS includes the STM8S208RB daughterboard and is optimized for STM8S series. STM8L devices require separate SWIM-compatible hardware with different voltage and clocking constraints; Raisonance offers distinct kits like STM8L-D/RAIS for that purpose.

Can the REva motherboard be used with non-ST microcontrollers?

No. The REva motherboard's firmware, RLink driver stack, and Ride7 IDE are validated exclusively for STM8 and ST7 families. Its SWIM/ICC/JTAG interface logic, pin mapping, and power sequencing are not compatible with ARM Cortex-M or other vendor MCUs.

Is the 2 KB code limit in Ride7 compiler enforceable in production builds?

Yes. The free Ride7 C compiler license restricts generated object code to ≤2 KB. Larger projects require purchasing a commercial Ride7 license. This limit applies only to compiled output - assembly, linking, and debugging remain fully functional regardless of code size.

What is the role of the SO-DIMM connector on the REva motherboard?

The SO-DIMM connector provides standardized mechanical and electrical interconnection between the REva motherboard and interchangeable daughterboards. It routes all MCU signals (I/O, SWIM, power, reset, clock), enabling hot-swappable evaluation of different STM8/ST7 devices without changing core evaluation hardware.