October 2021 AN2606 Rev 51 1/426

AN2606

Application note

STM32 microcontroller system memory boot mode

Introduction

The bootloader is stored in the internal boot ROM (system memory) of STM32 devices, and is

programmed by ST during production. Its main task is to download the application program to the

internal Flash memory through one of the available serial peripherals (such as USART, CAN,

USB, I

C, SPI). A communication protocol is defined for each serial interface, with a compatible

command set and sequence. This document applies to the products listed in

Table 1, referred to

as STM32 throughout the document. It describes the supported peripherals and hardware

requirements to consider when using the bootloader of STM32 devices.

www.st.com

AN2606

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Table 1. Applicable products

Type Part number or product series

Microcontrollers

STM32F0 Series: STM32F03xxx, STM32F04xxx, STM32F05xxx, STM32F07xxx, STM32F09xxx

STM32F1 Series

STM32F2 Series

STM32F3 Series: STM32F301xx, STM32F302xx, STM32F303xx, STM32F318xx, STM32F328xx,

STM32F334xx, STM32F358xx, STM32F373xx, STM32F378xx, STM32F398xx

STM32F4 Series: STM32F401xx, STM32F405xx, STM32F407xx, STM32F410xx, STM32F411xx,

STM32F412xx, STM32F413xx, STM32F415xx, STM32F417xx, STM32F423xx,

STM32F427xx, STM32F429xx, STM32F437xx, STM32F439xx, STM32F446xx,

STM32F469xx, STM32F479xx

STM32F7 Series: STM32F722xx, STM32F723xx, STM32F732xx, STM32F733xx, STM32F745xx,

STM32F746xx, STM32F756xx, STM32F765xx, STM32F767xx, STM32F769xx,

STM32F777xx, STM32F779xx

STM32G0 Series: STM32G030xx, STM32G031xx, STM32G041xx, STM32G07xxx, STM32G08xxx,

STM32G0B0xx, STM32G0B1xx, STM32G0C1xx, STM32G050xx, STM32G051xx,

STM32G061xx

STM32G4 Series: STM32G431xx, STM32G441xx, STM32G47xxx, STM32G48xxx, STM32G491xx,

STM32G4A1xx

STM32H7 Series: STM32H72xxx, STM32H73xxx, STM32H74xxx, STM32H75xxx, STM32H7A3xx,

STM32H7B3xx

STM32L0 Series

STM32L1 Series: STM32L100xx, STM32L151xx, STM32L152xx, STM32L162xx

STM32L4 Series: STM32L431xx, STM32L432xx, STM32L433xx, STM32L442xx, STM32L443xx,

STM32L451xx, STM32L452xx, STM32L462xx, STM32L471xx, STM32L475xx,

STM32L476xx, STM32L486xx, STM32L496xx, STM32L4A6xx, STM32L4R5xx,

STM32L4R7xx, STM32L4R9xx, STM32L4S5xx, STM32L4S7xx, STM32L4S9xx,

STM32L412xx, STM32L422xx, STM32L4P5xx, STM32L4Q5xx, STM32L431xx,

STM32L432xx, STM32L433xx, STM32L442xx, STM32L443xx, STM32L451xx,

STM32L452xx, STM32L462xx, STM32L471xx, STM32L475xx, STM32L476xx,

STM32L486xx, STM32L496xx, STM32L4A6xx, STM32L4R5xx, STM32L4R7xx,

STM32L4R9xx, STM32L4S5xx, STM32L4S7xx, STM32L4S9xx, STM32L412xx,

STM32L422xx, STM32L4P5xx, STM32L4Q5xx

STM32L5 Series: STM32L552xx, STM32L562xx

STM32WB Series: STM32WB10xx, STM32WB15xx, STM32WB30xx, STM32WB35xx, STM32WB50xx,

STM32WB55xx

STM32WL Series: STM32WLE5xx STM32WL55xx

STM32U5 Series STM32U575xx, STM32U585xx