STMicroelectronics STM8S208R8T6

Overview

STM8S208R8T6 from STMicroelectronics is an 8-bit high-performance microcontroller featuring a Harvard-architecture STM8 core, 24 MHz max CPU frequency, 64 KB Flash, 2 KB data EEPROM, 10-bit ADC with 16 channels, dual UARTs (including LIN-compliant UART3), SPI, I²C, and CAN 2.0B interface - deployed in automotive body control modules for real-time sensor fusion and actuator coordination.

For engineers reviewing the STM8S208R8T6 datasheet, STM8S208R8T6 pinout, STM8S208R8T6 application, or STM8S208R8T6 equivalent, key selection considerations include CAN bus timing compliance, SWIM debug interface support, 128 kHz low-power RC oscillator stability, and high-sink I/O capability for direct LED/relay drive without external buffers.

Technical Context

The STM8S208R8T6 implements a 3-stage pipelined Harvard architecture core with extended instruction set and nested interrupt controller supporting 32 interrupts and up to 37 external IRQs across 6 vectors. Its clock system integrates user-trimmable 16 MHz RC, low-power 128 kHz RC, and crystal oscillator with clock security monitoring.

Peripheral integration includes an advanced 16-bit TIM1 timer with dead-time insertion and complementary outputs for motor control, two 16-bit general-purpose timers (TIM2/TIM3), an 8-bit basic timer (TIM4), window/independent watchdogs, and beCAN supporting 1 Mbit/s active operation with message filtering and automatic retransmission.

Key Specifications

Pinout & Package

LQFP64 (10 × 10 mm, 0.5 mm pitch) package with exposed thermal pad; RoHS-compliant, industrial temperature range (–40 to +85 °C).

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar 8-bit microcontroller applications.

Compared with STM8S207R8T6, the STM8S208R8T6 adds essential CAN 2.0B support for vehicle networking, while the STM8AF5286 trades industrial temperature range for automotive reliability - making the R8T6 optimal for cost-sensitive body electronics within its thermal envelope.

Availability

STM8S208R8T6 is available at Aetrix Electronics and suitable for automotive body control units, industrial motor interfaces, smart energy metering modules, and medical infusion pump controllers requiring stable component supply across multi-year production cycles.

Supply support for STM8S208R8T6 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, Switzerland, designing and manufacturing microcontrollers, power management ICs, sensors, and analog devices for industrial, automotive, and consumer markets.

The STM8S series targets cost-sensitive, high-reliability 8-bit embedded applications requiring robust peripherals, low-power operation, and long-term supply assurance - especially in automotive body electronics and industrial controls.

FAQ

Does STM8S208R8T6 support in-circuit debugging via SWIM?

Yes. The STM8S208R8T6 features a Single Wire Interface Module (SWIM) that enables full-speed in-circuit debugging, flash programming, and real-time register/memory inspection using only one dedicated pin (SWIM). No JTAG header or additional debug hardware is required, and ST-LINK/V2 and compatible programmers provide full toolchain support.

What is the maximum operating frequency with 3.3 V supply?

At VDD = 3.3 V, the STM8S208R8T6 supports a maximum CPU frequency of 16 MHz with zero wait states, as confirmed by Figure 12 in the datasheet (DocID14733 Rev 13). Operation above 16 MHz at 3.3 V is not guaranteed and may result in timing violations or system instability.

Can UART3 be used simultaneously with CAN on the same device?

Yes. UART3 and CAN share no common I/O pins in the LQFP64 package: CAN_TX/CAN_RX map to PD0/PD1, while UART3_TX/UART3_RX map to PC3/PC2. Both peripherals operate independently with separate clock sources and interrupt vectors, enabling concurrent LIN master and CAN node functionality.

Is the 2 KB data EEPROM accessible during program execution?

Yes. The 2 KB data EEPROM supports read-while-write (RWW) operation, allowing firmware to execute from Flash while concurrently reading from or writing to EEPROM. Write operations require CPU stall (no instruction fetch), but background erasure and page write sequencing are managed by hardware, ensuring deterministic timing for critical data logging.