RM0402
56/1163 RM0402 Rev 6
Embedded bootloader
The embedded bootloader mode is used to reprogram the Flash memory using one of the
interface described in the table below. The availability of the interface is package
dependent.
The USART peripherals operate at the internal 16 MHz oscillator (HSI) frequency, while the
CAN and USB OTG FS require an external clock (HSE) multiple of 1 MHz (ranging from 4 to
26 MHz).
The embedded bootloader code is located in system memory. It is programmed by ST
during production. For additional information, refer to application note AN2606.
Physical remap in STM32F412xx
Once the boot pins are selected, the application software can modify the memory
accessible in the code area (in this way the code can be executed through the ICode bus in
place of the System bus). This modification is performed by programming the
Section 7.2.1:
SYSCFG memory remap register (SYSCFG_MEMRMP) in the SYSCFG controller.
The following memories can thus be remapped:
• Main Flash memory
• System memory
• Embedded SRAM
Table 3. Embedded bootloader interfaces
Package
USART1
PA9/
PA10
USART2
PD6/
PD5
USART3
PB11/
PB10
I2C1
PB6/
PB7
I2C2
PF0/
PF1
I2C3
PA8/
PB4
I2C
FMP1
PB14/
PB15
SPI1
PA4/
PA5/
PA6/
PA7
SPI3
PA15/
PC10/
PC11/
PC12
SPI4
PE11/
PE12/
PE13/
PE14
CAN2
PB5/
PB13
USB
PA11
/P12
UFQFPN48 Y - - Y - Y Y Y - - Y Y
WLCSP64 Y - - Y - Y Y Y Y - Y Y
LQFP64 Y - - Y - Y Y Y Y - Y Y
LQFP100Y Y - Y-YYYYYYY
LQFP144YYYYYYYYYYYY
UFBGA100 Y Y Y Y - Y Y Y Y Y Y Y
UFBGA144 Y Y Y Y Y Y Y Y Y Y Y Y
Table 4. Memory mapping vs. Boot mode/physical remap in STM32F412xx
Addresses
Boot/Remap in main
Flash memory
Boot/Remap in
embedded SRAM
Boot/Remap in
System memory
0x2000 0000 - 0x2003 FFFF SRAM (256 KB) SRAM (256KB) SRAM (256KB)
0x1FFF 0000 - 0x1FFF 77FF System memory System memory System memory
0x0802 0000 - 0x1FFE FFFF Reserved Reserved Reserved
0x0800 0000 - 0x080F FFFF Flash memory Flash memory Flash memory
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