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RM0008
Memory and bus architecture
The values on the BOOT pins are latched on the 4th rising edge of SYSCLK after a Reset. It
is up to the user to set the BOOT1 and BOOT0 pins after Reset to select the required boot
mode.
The BOOT pins are also re-sampled when exiting from Standby mode. Consequently they
must be kept in the required Boot mode configuration in Standby mode. After this startup
delay has elapsed, the CPU fetches the top-of-stack value from address 0x0000 0000, then
starts code execution from the boot memory starting from 0x0000 0004.
Due to its fixed memory map, the code area starts from address 0x0000 0000 (accessed
through the ICode/DCode buses) while the data area (SRAM) starts from address
0x2000 0000 (accessed through the system bus). The Cortex-M3 CPU always fetches the
reset vector on the ICode bus, which implies to have the boot space available only in the
code area (typically, Flash memory). STM32F10xxx microcontrollers implement a special
mechanism to be able to boot also from SRAM and not only from main Flash memory and
System memory.
Depending on the selected boot mode main Flash memory, System memory or SRAM is
accessible as follows:
●
●
●
Boot from main Flash memory: the main Flash memory is aliased in the boot memory
space (0x0000 0000), but still accessible from its original memory space (0x800 0000).
In other words, the Flash memory contents can be accessed starting from address
0x0000 0000 or 0x800 0000.
Boot from System memory: the System memory is aliased in the boot memory space
(0x0000 0000), but still accessible from its original memory space (0x1FFF B000 in
connectivity line devices, 0x1FFF F000 in other devices).
Boot from the embedded SRAM: SRAM is accessible only at address 0x2000 0000.
Note:
When booting from SRAM, in the application initialization code, you have to relocate the
vector table in SRAM using the NVIC exception table and offset register.
Embedded boot loader
The embedded boot loader is located in the System memory, programmed by ST during
production. It is used to reprogram the Flash memory with one of the available serial
interfaces:
●
●
In low-, medium- and high-density devices the bootloader is activated through the
USART1 interface. For further details please refer to AN2606.
In connectivity line devices the bootloader can be activated through one of the following
interfaces: USART1, USART2 (remapped), CAN2 (remapped) or USB OTG FS in
Device mode (DFU: device firmware upgrade).
The USART peripheral operates with the internal 8 MHz oscillator (HSI). The CAN and
USB OTG FS, however, can only function if an external 8 MHz, 14.7456 MHz or
25 MHz clock (HSE) is present. For further details, please refer to AN2662.
Doc ID 13902 Rev 9
49/995
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