STM8 Series Microcontrollers

1. Introduction

The **STM8 series** is a family of 8-bit microcontrollers from STMicroelectronics, designed for cost-effective embedded system applications. With a rich set of peripherals and multiple models, STM8 microcontrollers are used in consumer electronics, automotive, industrial automation, and many other embedded applications.

2. Key Features of STM8 Series

• 8-bit Harvard architecture with efficient performance
• Clock speeds up to 24 MHz
• Onboard Flash memory (up to 128 KB) and RAM (up to 4 KB)
• Advanced peripherals including ADC, PWM, timers, and communication interfaces
• Integrated EEPROM for non-volatile storage
• Low power consumption modes for battery-powered applications
• Flexible interrupt management and watchdog timers

3. STM8 Series Models

STM8S Series

The STM8S family is the most widely used sub-family of the STM8 series. It is designed for a broad range of applications and is available with various flash memory sizes and peripherals.

Model	Flash Size	RAM	Peripherals	Clock Speed	Interfaces
STM8S003F3	8 KB	1 KB	1x ADC, 1x SPI, 1x I²C	16 MHz	SPI, I²C
STM8S105K6	32 KB	2 KB	1x ADC, 1x SPI, 1x I²C, 2x UART	24 MHz	UART, SPI, I²C
STM8S208R8	128 KB	4 KB	1x ADC, 1x SPI, 2x I²C, 2x UART, Timers	24 MHz	UART, SPI, I²C

STM8L Series

The STM8L family is optimized for ultra-low power consumption, making it suitable for battery-operated devices. It includes a range of power-saving modes and is ideal for portable and energy-efficient applications.

Model	Flash Size	RAM	Peripherals	Clock Speed	Interfaces
STM8L010F4	8 KB	1 KB	1x ADC, 1x SPI, 1x I²C	16 MHz	SPI, I²C
STM8L151C6	32 KB	2 KB	1x ADC, 1x SPI, 2x I²C, 1x UART	32 MHz	UART, SPI, I²C
STM8L152R8	128 KB	4 KB	1x ADC, 1x SPI, 2x I²C, 2x UART, Timers	32 MHz	UART, SPI, I²C

4. Onboard Peripherals

Common Peripherals in STM8

• Analog-to-Digital Converter (ADC): Typically 8-10 bits, up to 16 channels (for STM8S and STM8L series).
• Timers: 8-bit and 16-bit timers with PWM capabilities.
• Watchdog Timer: Built-in hardware feature to reset the MCU in case of a software crash.
• Serial Communication Interfaces: I²C, SPI, UART for communication with other devices.
• Low-Power Modes: Sleep, stop, and standby modes for battery-saving applications.

5. Applications

The STM8 series microcontrollers are used in a wide range of applications, including but not limited to:

• Consumer Electronics (e.g., smart home devices, toys)
• Automotive (e.g., sensors, lighting controls)
• Industrial Automation (e.g., sensors, actuators, controllers)
• Portable Devices (e.g., fitness trackers, low-power sensors)
• Medical Devices (e.g., portable diagnostic equipment)