Home | Projects | Notes > Bootloader > STM32F407xx Memory Organization

STM32F407xx Memory Organization

STM32F407xx Memory Organization

• Internal Flash (a.k.a. embedded Flash / on-chip Flash) memory: Up to 1 MB (Divided into multiple sectors)

• Internal SRAM1: 112 KB

• Internal SRAM2: 16 KB

• System memory (ROM): 30 KB

  • Used by ST for storing the ST's native bootloader

• One-time programmable (OTP) memory: 528 Bytes

  • Typically used for storing the product number of the serial number of a product

• Option bytes memory: 16 Bytes

  • Not for general-purpose use

  • These bytes contain some flags, which control the access to the Flash memory.

• Backup SRAM: 4 KB

Internal Flash Memory (Main Memory)

• Capacity (size): up to 1 MB (Divided into multiple sectors)

• Address range: 0x0800 0000 - 0x080F FFFF

• Used for storing

  • The user application code

  • The read-only data of the program

  • The vector table

• Non-volatile memory

Internal SRAM

SRAM1

• Size: 112 KB

• Address range: 0x2000 0000 - 0x2001 BFFF

• Used for

  • The user application global variables and static variables

  • The stack and heap

• Volatile memory

• Code can be executed from this memory

SRAM2

• Size: 16 KB

• Address range: 0x2001 C000 - 0x2001 FFFF

• Used for

  • The user application global variables and static variables

  • The stack and heap

• Volatile memory

• Code can be executed from this memory

System Memory (ROM)

• Size: 30 KB

• Address range: 0x01FFF 0000 - 0x1FFF 77FF

• All the ST MCUs store the bootloader in this memory

• Read-only memory

• By default, the MCU will not execute any code from this memory, it can be configured to boot or execute the bootloader from this memory.