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The STM8AF6246, STM8AF6248, STM8AF6266 and STM8AF6268 automotive 8-bit microcontrollers offer from 16 to 32 Kbyte of Flash program memory and integrated true data EEPROM. They are referred to as medium density STM8A devices in STM8S series and STM8AF series 8-bit microcontrollers reference manual (RM0016).
All devices of the STM8A product line provide the following benefits: reduced system cost, performance and 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 a clock frequency of up to 16 MHz CPU 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 STM8A family thanks to their advanced core which is made in a state-of-the art technology for automotive applications with 3.3 V to 5 V operating supply.
All STM8A and ST7 microcontrollers are supported by the same tools including STVD/STVP development environment, the STice emulator and a low-cost, third party in-circuit debugging tool.Key Features
- AEC-Q10x qualified
- Core
- Max fCPU: 16 MHz
- Advanced STM8A core with Harvard architecture and 3-stage pipeline
- Average 1.6 cycles/instruction resulting in 10 MIPS at 16 MHz fCPUfor industry standard benchmark
- Memories
- Flash Program memory: 16 to 32 Kbyte Flash; data retention 20 years at 55 °C after 1 kcycle
- Data memory: 0.5 to 1 Kbyte true data EEPROM; endurance 300 kcycle
- RAM: 2 Kbyte
- Clock management
- Low-power crystal resonator oscillator with external clock input
- Internal, user-trimmable 16 MHz RC and low-power 128 kHz RC oscillators
- Clock security system with clock monitor
- Reset and supply management
- Wait/auto-wakeup/Halt low-power modes with user definable clock gating
- Low consumption power-on and power-down reset
- Interrupt management
- Nested interrupt controller with 32 vectors
- Up to 34 external interrupts on 5 vectors
- Timers
- Up to 2 general purpose 16-bit PWM timers with up to 3 CAPCOM channels each (IC, OC or PWM)
- Advanced control timer: 16-bit, 4 CAPCOM channels, 3 complementary outputs, dead-time insertion and flexible synchronization
- 8-bit AR basic timer with 8-bit prescaler
- Auto-wakeup timer
- Window and independent watchdog timers
- Communication interfaces
- LINUART
- LIN 2.2 compliant, master/slave modes with automatic resynchronization
- SPI interface up to 8 Mbit/s or fMASTER/2
- I2C interface up to 400 Kbit/s
- Analog-to-digital converter (ADC)
- 10-bit accuracy, 2LSB TUE accuracy, 2LSB TUE linearity ADC and up to 10 multiplexed channels with individual data buffer
- Analog watchdog, scan and continuous sampling mode
- I/Os
- Up to 38 user pins including 10 HS I/Os
- Highly robust I/O design, immune against current injection
- Operating temperature up to 150 °C
- Qualification conforms to AEC-Q100 rev G
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Featured Videos
We asked Christophe the following questions: - How is ST engaged in the 8-bit MCU market ? - What benefits does the STM8 bring? - What applications are suitable for STM8 (no change) - What kind of ecosystem does STM8 have?
8-bit microcontrollers for industrial and mass-market applications
Here is an opportunity to get to learn the basics of our STM8S value line !
Development Tools
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Picture Part number Manufacturer Description CYCLONE P&E Microcomputer Systems Automated, Stand-Alone Production Programmer, Debug & Test. CYCLONE FX P&E Microcomputer Systems Automated, Stand-Alone Production Programmer, Debug & Test. 
FlashPro Elprotronic Flash programmer for STM8 and ARM based MCUs. 
GangPro Elprotronic Gang programmer for STM8 and ARM based MCUs. Lauterbach PowerDebug for STM8 Lauterbach Debug Solution for STM8 series. 
ST-LINK/V2 ST ST-LINK/V2 in-circuit debugger/programmer for STM8 and STM32 
STLINK-V3SET ST STLINK-V3 modular in-circuit debugger and programmer for STM32/STM8 Part NumberAutomated, Stand-Alone Production Programmer, Debug & Test.
Automated, Stand-Alone Production Programmer, Debug & Test.
Flash programmer for STM8 and ARM based MCUs.
Gang programmer for STM8 and ARM based MCUs.
Debug Solution for STM8 series.
ST-LINK/V2 in-circuit debugger/programmer for STM8 and STM32
STLINK-V3 modular in-circuit debugger and programmer for STM32/STM8
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Picture Part number Manufacturer Description CXSTM8 Cosmic Software C Compiler and associated tools for the STM8 family FLASHER-STM8 ST STM8 Flash loader demonstrator (UM0462) IAR C-STAT IAR Systems Static analysis tool; add-on product to IAR Embedded Workbench IAR Embedded Workbench for STM8 IAR Systems Integrated Development Environment. IAR Embedded Workbench for STM8 - Functional Safety IAR Systems Integrated Development Environment. IAR Visual State IAR Systems State-machine modelling tool RIDE-STM8 Raisonance Raisonance branded integrated development environment for STM8 MCUs 
STM-STUDIO-STM8 ST STM Studio run-time variables monitoring and visualization tool for STM8 microcontrollers 
STM8CubeMX ST STM8Cube configuration and report tool STVD-STM8 ST ST Visual develop IDE for developing ST7 and STM8 applications STVP-LIB-STM8 ST STVP programming toolkit: C++ source files for creating PC programming interface STVP-STM8 ST ST Visual Programmer STM8 winIDEA-STM8 iSYSTEM iSYSTEM's complete software development and test solution for the STM8 MCUs Part NumberC Compiler and associated tools for the STM8 family
STM8 Flash loader demonstrator (UM0462)
Static analysis tool; add-on product to IAR Embedded Workbench
Integrated Development Environment.
Integrated Development Environment.
State-machine modelling tool
Raisonance branded integrated development environment for STM8 MCUs
STM Studio run-time variables monitoring and visualization tool for STM8 microcontrollers
STM8Cube configuration and report tool
ST Visual develop IDE for developing ST7 and STM8 applications
STVP programming toolkit: C++ source files for creating PC programming interface
ST Visual Programmer STM8
iSYSTEM's complete software development and test solution for the STM8 MCUs
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Embedded Software
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Picture Part number Manufacturer Description STM8-SafeCLASSB ST Functional safety package to achieve IEC 60730 Class B certification with the STM8 
STM8A-SafeASIL ST Functional safety package for STM8AF microcontrollers in systems implementing safety functions up to ISO 26262 automotive safety integrity level ASIL B STM8S-TOUCH-LIB -- STM8S touch-sensing library STSW-STM8004 ST STM8 optimized I2C examples (AN3281) STSW-STM8006 ST Example of implementation of user bootloader (AN2659) STSW-STM8020 ST STM8S and STM8A BLDC and ACIM motor control firmware library V1.0 (UM0708) STSW-STM8045 ST Audio software codec for the STM8S STSW-STM8048 ST Precision improvement techniques for the A/D converter of the STM8 microcontroller (AN2719) STSW-STM8049 ST Basic in-application programming example using the STM8 I2C and SPI peripherals (AN2737) STSW-STM8050 ST Real-time keeping on STM8S devices and usage of auto-wakeup unit (AWU) and beeper (AN2780) STSW-STM8051 ST UART emulation software in STM8S and STM8A microcontrollers (AN2781) STSW-STM8062 ST STM8 in-application programming (IAP) using a customized bootloader (AN2659) STSW-STM8064 ST Setup screensaver STM8 1024x768 STSW-STM8065 ST Setup screensaver STM8 1280x1024 STSW-STM8068 ST Erase/write routines for STM8 ROM bootloader (UM0560) STSW-STM8069 ST STM8S/A Standard peripheral library STSW-STM8074 ST LIN communication with two STM8AF boards of STM8A-DISCOVERY (AN4178) STSW-STM8076 ST Analog-to-digital converter on STM8L and STM8AL devices: description and precision improvement techniques STSW-STM8077 ST STM8AF and STM8S HSI oscillator calibration using LIN automatic resynchronization (AN3258) STSW-STM8A-J2602 ST STM8A J2602 software package STSW-STM8A-LIN ST STM8A LIN 2.1 software package Part NumberFunctional safety package to achieve IEC 60730 Class B certification with the STM8
Functional safety package for STM8AF microcontrollers in systems implementing safety functions up to ISO 26262 automotive safety integrity level ASIL B
STM8S touch-sensing library
STM8 optimized I2C examples (AN3281)
Example of implementation of user bootloader (AN2659)
STM8S and STM8A BLDC and ACIM motor control firmware library V1.0 (UM0708)
Audio software codec for the STM8S
Precision improvement techniques for the A/D converter of the STM8 microcontroller (AN2719)
Basic in-application programming example using the STM8 I2C and SPI peripherals (AN2737)
Real-time keeping on STM8S devices and usage of auto-wakeup unit (AWU) and beeper (AN2780)
UART emulation software in STM8S and STM8A microcontrollers (AN2781)
STM8 in-application programming (IAP) using a customized bootloader (AN2659)
Setup screensaver STM8 1024x768
Setup screensaver STM8 1280x1024
Erase/write routines for STM8 ROM bootloader (UM0560)
STM8S/A Standard peripheral library
LIN communication with two STM8AF boards of STM8A-DISCOVERY (AN4178)
Analog-to-digital converter on STM8L and STM8AL devices: description and precision improvement techniques
STM8AF and STM8S HSI oscillator calibration using LIN automatic resynchronization (AN3258)
STM8A J2602 software package
STM8A LIN 2.1 software package
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Evaluation Tools
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Picture Part number Manufacturer Description 
NUCLEO-8S207K8 ST STM8 Nucleo-32 development board with STM8S207K8 MCU, supports Arduino Nano connectivity 
STM8A-DISCOVERY ST Discovery kit with STM8AF5288 and STM8AL3L68 MCUs 
STM8A/128-EVAL ST Evaluation board for STM8AF series - with STM8AF51AA/STM8AF52AA MCU Part NumberSTM8 Nucleo-32 development board with STM8S207K8 MCU, supports Arduino Nano connectivity
Discovery kit with STM8AF5288 and STM8AL3L68 MCUs
Evaluation board for STM8AF series - with STM8AF51AA/STM8AF52AA MCU
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Picture Part number Manufacturer Description 
STEVAL-LLL002V1 ST Evaluation kit for automotive rear lights with pattern animations based on ALED1262ZT and STM8AF6266 Part NumberEvaluation kit for automotive rear lights with pattern animations based on ALED1262ZT and STM8AF6266
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Support and Applications
Quality and Reliability
| Part Number | Marketing Status | Package | Grade | RoHS Compliance Grade | Material Declaration** |
|---|---|---|---|---|---|
| STM8AF6266ITCX |
Active
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LQFP 32 7x7x1.4 | Automotive | Ecopack2 | |
| STM8AF6266ITCY |
Active
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LQFP 32 7x7x1.4 | Automotive | Ecopack2 | |
| STM8AF6266TAX |
Active
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LQFP 32 7x7x1.4 | Automotive | Ecopack2 | |
| STM8AF6266TAY |
Active
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LQFP 32 7x7x1.4 | Automotive | Ecopack2 | |
| STM8AF6266TCX |
Active
|
LQFP 32 7x7x1.4 | Automotive | Ecopack2 | |
| STM8AF6266TCY |
Active
|
LQFP 32 7x7x1.4 | Automotive | Ecopack2 | |
| STM8AF6266TDX |
Active
|
LQFP 32 7x7x1.4 | Automotive | Ecopack2 | |
| STM8AF6266TDY |
Active
|
LQFP 32 7x7x1.4 | Automotive | Ecopack2 | |
| STM8AF6266UCX |
Active
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VFQFPN 32 5x5x1.0 | Automotive | Ecopack2 |
(**) The Material Declaration forms available on st.com 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.
Sample & Buy
| Part Number | Order from Distributors | Order from ST | Marketing Status | ECCN (US) | ECCN (EU) | Packing Type | Package | Temperature (°C) | Country of Origin | Budgetary Price (US$)*/Qty | ||
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| min | max | |||||||||||
| STM8AF6266TAX | 3 distributors | Buy now |
Active
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EAR99 | NEC | Tape And Reel | LQFP 32 7x7x1.4 | -40 | 85 | MALAYSIA | 0.8765 / 10k | |
| STM8AF6266TDX | 2 distributors | Buy now |
Active
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EAR99 | NEC | Tape And Reel | LQFP 32 7x7x1.4 | -40 | 150 | MALAYSIA | 1.0957 / 10k | |
| STM8AF6266TAY | 1 distributors | Buy now |
Active
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EAR99 | NEC | Tray | LQFP 32 7x7x1.4 | -40 | 85 | MALAYSIA | 0.8765 / 10k | |
| STM8AF6266ITCY | 2 distributors | Buy now |
Active
|
EAR99 | NEC | Tray | LQFP 32 7x7x1.4 | -40 | 125 | MALAYSIA | 1.0281 / 10k | |
| STM8AF6266TCX | 5 distributors | Buy now |
Active
|
EAR99 | NEC | Tape And Reel | LQFP 32 7x7x1.4 | -40 | 125 | MALAYSIA | 0.9379 / 10k | |
| STM8AF6266ITCX | 2 distributors | Buy now |
Active
|
EAR99 | NEC | Tape And Reel | LQFP 32 7x7x1.4 | -40 | 125 | MALAYSIA | 1.0281 / 10k | |
| STM8AF6266TCY | 4 distributors | Buy now |
Active
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EAR99 | NEC | Tray | LQFP 32 7x7x1.4 | -40 | 125 | MALAYSIA | 0.9379 / 10k | |
| STM8AF6266UCX | 2 distributors | Buy now |
Active
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EAR99 | NEC | Tape And Reel | VFQFPN 32 5x5x1.0 | -40 | 125 | PHILIPPINES | 0.8477 / 10k | |
| STM8AF6266TDY | 2 distributors | Buy now |
Active
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EAR99 | NEC | Tray | LQFP 32 7x7x1.4 | -40 | 150 | MALAYSIA | 1.0957 / 10k | |
(*) Suggested Resale Price per unit (USD) for BUDGETARY USE ONLY. For quotes, prices in local currency, please contact your local ST Sales Office  or our Distributors