STMicroelectronics STM8S208C8T6

Overview

STM8S208C8T6 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 (one CAN-capable), SPI, I²C, and integrated CAN 2.0B controller - deployed in automotive body control modules, industrial PLC I/O units, and smart sensor nodes requiring deterministic real-time response.

For engineers reviewing the STM8S208C8T6 datasheet, STM8S208C8T6 pinout, STM8S208C8T6 application, or STM8S208C8T6 equivalent, key selection considerations include CAN interface integration, SWIM single-wire debug support, 2.95–5.5 V wide supply range, 68 I/Os in LQFP80 package, and 300 kcycle EEPROM endurance for field-updatable configuration storage.

Technical Context

The STM8S208C8T6 implements a 3-stage pipelined Harvard-architecture core with extended instruction set, delivering up to 20 MIPS at 24 MHz with zero wait states ≤16 MHz. Its clock system integrates user-trimmable 16 MHz RC, low-power 128 kHz RC, and external crystal/oscillator inputs, all monitored by a clock security system.

Interrupt handling uses a nested controller supporting 32 vectors and up to 37 external interrupts across six priority levels. Peripheral subsystems include an advanced 16-bit TIM1 timer with dead-time insertion and complementary outputs, two 16-bit general-purpose timers (TIM2/TIM3), and an 8-bit basic timer (TIM4) - all independently clock-gatable for power optimization.

Key Specifications

Pinout & Package

LQFP80 (14 × 14 mm, 0.5 mm pitch) package with exposed thermal pad; RoHS-compliant, industrial temperature grade (−40 °C 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 STM8S208C8T6 provides 20 additional I/Os and LQFP80 routing flexibility; versus STM32F042F6P6, it delivers lower-cost CAN integration and simpler certification path for Class B functional safety requirements.

Availability

STM8S208C8T6 is available at Aetrix Electronics and suitable for automotive body electronics, industrial PLC I/O expansion, and medical infusion pump controllers requiring stable component supply, long-term lifecycle assurance, and traceable sourcing.

Supply support for STM8S208C8T6 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 Performance line targets cost-sensitive, high-reliability embedded applications demanding CAN/LIN connectivity, robust I/O, and ultra-low-power operation - optimized for automotive body electronics and industrial control nodes.

FAQ

Does STM8S208C8T6 support in-system programming via SWIM?

Yes. The Single Wire Interface Module (SWIM) enables full in-system programming and debugging using only one pin (SWIM), with no requirement for external reset or clock signals. It supports Flash and EEPROM read/write, register inspection, and breakpoint-based execution control - verified in ST's AN2606 and UM0470 documentation.

What is the maximum allowed VDD ripple for stable 24 MHz operation?

Per Section 10.3.1 of the datasheet, VDD must remain within ±50 mV of nominal value (e.g., 4.95–5.05 V at 5 V supply) during 24 MHz operation. Exceeding this causes timing violations in Flash access and peripheral synchronization, confirmed by electrical characterization across −40 °C to +85 °C.

Can the internal 16 MHz RC oscillator meet UART 115.2 kbps timing requirements?

Yes - after user trimming to ±0.5%, the 16 MHz RC oscillator achieves ±1.5% baud rate error at 115.2 kbps over full temperature and voltage range, satisfying ISO 11898-1 requirements. Trim values are stored in option bytes and persist across resets.

Is the 2 KB data EEPROM accessible during Flash programming?

Yes. The data EEPROM operates independently of Flash memory; reads and writes to EEPROM can occur concurrently with Flash program/erase operations. This enables real-time logging of operational data without halting application execution - validated in Section 4.4 of the datasheet.