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October 2011 Doc ID 022104 Rev 1 1/13
AN3965
Application note
STM32F40x/STM32F41x in-application programming
using the USART
1 Introduction
An important requirement for most Flash-memory-based systems is the ability to update
firmware when installed in the end product. This ability is referred to as in-application
programming (IAP). The purpose of this application note is to provide general guidelines for
creating an IAP application.
The STM32F4xx microcontroller can run user-specific firmware to perform IAP of the
microcontroller-embedded Flash memory. This feature allows the use of any type of
communication protocol for the reprogramming process. The USART is the example used in
this application note.
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