AN2078 Datasheet - STMicroelectronics

Introduction
An important requirement for most Flash-based systems is the ability to update firmware while the system is installed in the end product. This is referred to as In-Application Programming (IAP).

STR7xx MCUs have the capability of running user-specific firmware to perform In Application Programming of the MCU embedded Flash memory. This feature allows the use of any type of communication protocol for the reprogramming process (for example, CAN, UART, USB). In this application note, UART is used as an example.
This application note outlines general guidelines for creating an IAP application. The STR7xx Eval Boards were used to validate the IAP driver.

Software is provided and is available on //www.st.com/mcu