STMicroelectronics STM8/128-EVAL

Overview

STM8/128-EVAL from STMicroelectronics is an evaluation board for the STM8S2xx 8-bit microcontroller family, featuring CAN2.0A/B, dual UART with smartcard/IrDA/LIN support, 128 KB Flash, 2 KB data EEPROM, microSD™ interface, I²C EEPROM, motor control connector, and SWIM debugging. It serves as a complete hardware platform for peripheral validation and firmware development in industrial control and automotive subsystem prototyping.

For engineers reviewing the STM8/128-EVAL datasheet, STM8/128-EVAL pinout, STM8/128-EVAL application, or STM8/128-EVAL equivalent, this board enables rapid evaluation of CAN, LIN, smartcard, audio I/O, motor control, and secure element interfaces with full debug visibility via ST-LINK-compatible SWIM.

Technical Context

The board hosts an STM8S2xx MCU with integrated CAN controller, two LIN transceivers, dual RS-232 channels, IrDA physical layer, and dedicated smartcard A/B type interfaces. It supports real-time motor control via dedicated inductor driver connector and provides direct access to all GPIO, timer, ADC, and communication peripherals through extension headers.

Hardware resources include a 122×32 serial LCD, 4-direction joystick with selector, tamper/reset/wakeup/user buttons, four LEDs, and 64 Kbit I²C EEPROM for nonvolatile configuration storage - enabling full-system behavioral testing without external components.

Key Specifications

Availability

STM8/128-EVAL is available at Aetrix Electronics and suitable for industrial HMI development, automotive ECU prototyping, and smartcard-based security system validation requiring stable component supply and long-term design support.

Supply support for STM8/128-EVAL 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

STMicroelectronics is a global semiconductor leader headquartered in Geneva, designing and manufacturing microcontrollers, power ICs, sensors, and analog devices for industrial, automotive, and consumer applications.

This board belongs to ST's STM8 evaluation platform series, created to accelerate firmware development and hardware integration for cost-sensitive, low-power 8-bit embedded systems with mixed-signal and communication peripheral requirements.

FAQ

Does STM8/128-EVAL support CAN FD?

No. The board implements CAN2.0A/B only, using the STM8S2xx's legacy CAN controller. It lacks CAN FD protocol support, transceiver compatibility, or required clock domain enhancements. For CAN FD evaluation, ST recommends the STM32G4 or STM32H7-based NUCLEO boards with SAE J2284-compliant PHYs.

Can I replace the onboard STM8S2xx with another STM8 variant?

No. The board is specifically laid out for the STM8S2xx package (LQFP64), with fixed routing for CAN, LIN, smartcard, and motor control signals. Pinouts and peripheral mappings differ across STM8 families; substituting other variants like STM8L or STM8AF will cause functional failure or damage due to voltage, timing, or signal incompatibility.

Is the microSD™ interface SDIO or SPI mode?

The microSD™ slot operates exclusively in SPI mode, driven by the STM8S2xx's SPI peripheral. It does not implement SDIO command set or 4-bit wide bus operation. File system support (e.g., FAT16/FAT32) must be implemented in firmware using standard SPI read/write primitives.

What debug tools are natively supported?

The board supports SWIM (Single Wire Interface Module) debugging only, compatible with ST-LINK/V2-ISOL, ST-LINK/V2, and STice adapters. It does not support JTAG, SWD, or CMSIS-DAP. Debugging requires STM8-specific toolchains (e.g., STVD, Cosmic C, or open-source sdcc with stm8flash).