STMicroelectronics STM8 User Manual

Serial Communication (UART)
Serial communication is perhaps the mostly-used classic communication method for interfacing a PC
or other machines with a micro. With just two wire, we can achieve a full-duplex point-to-point
communication. Owing to its simplicity and wide usage, it is the communication interface backbone
that is used with GSM modems, RF modules, Bluetooth devices like RN-52, Wi-Fi devices like the
popular ESP8266, etc. It is also widely used in industries. Other communications rely on it, for example,
RS-485, LIN, etc.
Most STM8s have at least one UART module. Some have more than one. Different UARTs have
different features as shown:
To learn more about UART visit the following link:
https://learn.mikroe.com/uart-serial-communication/
The UARTs of STM8 micros are so robust and packed with so many features that it is quite impossible
to explain them all in this one article. Here we will explore the basic serial communication only. LIN
and IRDA will hopefully be covered in future articles.

STMicroelectronics STM8 Specifications

General

ADC Resolution	10-bit
Core	STM8
Maximum Clock Frequency	Up to 24 MHz
Flash Memory	Up to 128 KB
RAM	Up to 6 KB
EEPROM	Up to 2 KB
Operating Voltage	2.95 V to 5.5 V
Operating Temperature	-40°C to +85°C or +125°C
Communication Interfaces	UART, SPI, I2C
Package Options	LQFP, TSSOP, UFQFPN, SO

Summary

Hardware Tools

Software Tools

Creating a New Code Project

Uploading Code

General Purpose Input Output (GPIO)

Clock System (CLK)

External Interrupt (EXTI)

Alphanumerical LCD

Analog-to-Digital Converter (ADC)

Analog Watchdog (AWD)

Independent Watchdog (IWDG)

Window Watchdog (WWDG)

Time Base Generation (TIM2)

Timer Interrupt (TIM4)

General Purpose Pulse Width Modulation (TIM2 PWM)

Advanced Pulse Width Modulation (TIM1 PWM)

Timer Input Capture (TIM1 & TIM2)

Serial Communication (UART)

Serial Peripheral Interface (SPI)

Inter-Integrated Circuit (I2C)

Peripheral Clock Configurations

Unlocking a Locked STM8 Chip