STMicroelectronics STM8/128-D/RAIS

Overview

STM8/128-D/RAIS from Raisonance is a standalone interchangeable daughterboard featuring the STM8S208RB 8-bit microcontroller in LQFP64 package, supporting SWIM-based in-circuit debugging and programming, with on-board clock source selection jumper and oscillator footprint for flexible timing configuration. It enables rapid application development for industrial control, sensor interface, and motor control systems requiring 128 KB Flash, 6 KB RAM, and integrated ADC, SPI, I²C, and UART peripherals.

For engineers reviewing the STM8/128-D/RAIS datasheet, STM8/128-D/RAIS pinout, STM8/128-D/RAIS application, or STM8/128-D/RAIS equivalent, this page delivers verified hardware integration details, REva motherboard compatibility, SWIM protocol support, MCU-specific peripheral mapping, and Raisonance Ride7/RFlasher7 toolchain alignment - all critical for embedded firmware bring-up and production-ready evaluation.

Technical Context

The STM8/128-D/RAIS is a plug-in daughterboard designed exclusively for use with the REva universal evaluation platform. It hosts the STM8S208RB MCU, which integrates a 16 MHz internal RC oscillator, 24 MHz max system clock via external crystal, and SWIM debug interface compliant with STMicroelectronics' single-wire protocol.

It connects to the REva motherboard via a standard SO-DIMM connector, enabling access to digital/analog I/O, temperature sensor, potentiometer, I²C EEPROM, RS-232 driver, and configurable VDD (1.8 V / 3.3 V / 5 V) - all without external power, as the board draws power via USB from the embedded RLink.

Key Specifications

Availability

STM8/128-D/RAIS is available at Aetrix Electronics and suitable for industrial HMI development, sensor node prototyping, motor control evaluation, and educational MCU labs requiring stable component supply and long-term toolchain continuity.

Supply support for STM8/128-D/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 IDE solutions for STMicroelectronics, Silicon Labs, and other semiconductor vendors since 1992.

This daughterboard belongs to the REva family - a modular evaluation architecture designed to decouple MCU hardware evaluation from motherboard investment, enabling cost-effective migration across STM8 and ST7 device variants using shared infrastructure.

FAQ

Is STM8/128-D/RAIS compatible with ST-LINK or other third-party debuggers?

No. STM8/128-D/RAIS relies exclusively on Raisonance's embedded RLink interface and SWIM protocol. ST-LINK does not support SWIM; only RLink (integrated in REva kits) or standalone RLink adapters provide full debugging and programming functionality for this board.

Does this daughterboard include an external crystal oscillator?

No. The STM8/128-D/RAIS provides an oscillator footprint and clock source selection jumper but ships without a mounted crystal. Users must install a compatible 1–24 MHz crystal (e.g., 8 MHz or 16 MHz) depending on target application timing requirements.

Can STM8/128-D/RAIS operate independently without the REva motherboard?

No. It is a daughterboard only - it lacks power regulation, USB interface, I/O peripherals, and debug circuitry. Full functionality requires connection to the REva motherboard, which supplies power, USB connectivity, analog/digital resources, and RLink debug interface.

Which software tools are officially supported for firmware development?

Raisonance Ride7 IDE (with built-in STM8 C compiler, SIMICE simulator, RBuilder peripheral configurator, and debugger) and RFlasher7 (for mass programming and memory verification) are the only officially supported tools. ST's STM8CubeIDE does not support SWIM-based debugging on this hardware.