AN4228 datasheet(9/90 Pages) STMICROELECTRONICS

Part #	AN4228

Description	Migrating from STM32F1 to STM32F3 microcontrollers

PDF	90 Pages

Scroll/Zoom	100%

Manufacturer	STMICROELECTRONICS [STMicroelectronics]

Direct Link	http://www.st.com

Logo

9 / 90 page

DocID024110 Rev 5

9/90

AN4228

Boot mode compatibility

The way to select the boot mode on the STM32F3 series differs from STM32F1 series.

Instead of using two pins for this setting, STM32F3 series devices gets the nBOOT1 value

from an option bit located in the User option bytes at 0x1FFFF800 memory address.

Together with the BOOT0 pin, it selects the boot mode to the main Flash memory, the

SRAM or to the System memory. Table 6 summarizes the different configurations available

for selecting the Boot mode.

Note:

The BOOT1 value is the opposite of the nBOOT1 option bit.

Table 6. Boot modes

STM32F3/STM32F1

Boot mode selection

Boot mode

Aliasing

BOOT1

BOOT0

Main Flash memory

Main Flash memory is selected

as boot space

System memory

System memory is selected as

boot space

Embedded SRAM

Embedded SRAM is selected as

boot space

AN4228 Datasheet(PDF) 9 Page - STMicroelectronics