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Mainstream Performance line 8-bit MCU with 128 Kbytes Flash, 24 MHz CPU, integrated EEPROM

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Product overview


The STM8S20xxx performance line 8-bit microcontrollers offer from 32 to 128 Kbytes Flash program memory. They are referred to as high-density devices in the STM8S microcontroller family reference manual.

All STM8S20xxx devices provide the following benefits: reduced system cost, performance robustness, short development cycles, and product longevity.

The system cost is reduced thanks to an integrated true data EEPROM for up to 300 k write/erase cycles and a high system integration level with internal clock oscillators, watchdog, and brown-out reset.

Device performance is ensured by 20 MIPS at 24 MHz CPU clock frequency and enhanced characteristics which include robust I/O, independent watchdogs (with a separate clock source), and a clock security system.

Short development cycles are guaranteed due to application scalability across a common family product architecture with compatible pinout, memory map and modular peripherals. Full documentation is offered with a wide choice of development tools.

Product longevity is ensured in the STM8S family thanks to their advanced core which is made in a state-of-the art technology for applications with 2.95 V to 5.5 V operating supply.

  • All features

    • Core
      • Max fCPU: up to 24 MHz, 0 wait states @ fCPU≤ 16 MHz
      • Advanced STM8 core with Harvard architecture and 3-stage pipeline
      • Extended instruction set
      • Max 20 MIPS @ 24 MHz
    • Memories
      • Program: up to 128 Kbytes Flash; data retention 20 years at 55 °C after 10 kcycles
      • Data: up to 2 Kbytes true data EEPROM; endurance 300 kcycles
      • RAM: up to 6 Kbytes
    • Clock, reset and supply management
      • 2.95 to 5.5 V operating voltage
      • Low power crystal resonator oscillator
      • External clock input
      • Internal, user-trimmable 16 MHz RC
      • Internal low power 128 kHz RC
      • Clock security system with clock monitor
      • Wait, active-halt, & halt low power modes
      • Peripheral clocks switched off individually
      • Permanently active, low consumption power-on and power-down reset
    • Interrupt management
      • Nested interrupt controller with 32 interrupts
      • Up to 37 external interrupts on 6 vectors
    • Timers
      • 2x 16-bit general purpose timers, with 2+3 CAPCOM channels (IC, OC or PWM)
      • Advanced control timer: 16-bit, 4 CAPCOM channels, 3 complementary outputs, dead-time insertion and flexible synchronization
      • 8-bit basic timer with 8-bit prescaler
      • Auto wakeup timer
      • Window watchdog, independent watchdog
    • Communications interfaces
      • High speed 1 Mbit/s active beCAN 2.0B
      • UART with clock output for synchronous operation - LIN master mode
      • UART with LIN 2.1 compliant, master/slave modes and automatic resynchronization
      • SPI interface up to 10 Mbit/s
      • I2C interface up to 400 Kbit/s
    • 10-bit ADC with up to 16 channels
    • I/Os
      • Up to 68 I/Os on an 80-pin package including 18 high sink outputs
      • Highly robust I/O design, immune against current injection
      • Development support
      • Single wire interface module (SWIM) and debug module (DM)
    • 96-bit unique ID key for each device

Circuit Diagram

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STMicroelectronics - STM8S208MB

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Quality and Reliability

Part Number Marketing Status Package Grade RoHS Compliance Grade Material Declaration**
LQFP 80 14x14x1.4 mm Industrial Ecopack2



LQFP 80 14x14x1.4 mm

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LQFP 80 14x14x1.4 mm



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(**) The Material Declaration forms available on may be generic documents based on the most commonly used package within a package family. For this reason, they may not be 100% accurate for a specific device. Please contact our sales support for information on specific devices.

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