Boot configuration AN4938
26/46 AN4938 Rev 4
5.2 Boot pin connection
Figure 14 shows the external connection required to select the boot memory of
STM32H74xI/G and STM32H75xI/G microcontrollers.
Figure 14. Boot mode selection implementation example
1. Resistor values are given only as a typical example.
5.3 System bootloader mode
The embedded bootloader code is located in the system memory. It is programmed by ST
during production. It is used to reprogram the Flash memory using one of the following serial
interfaces.
Table 3 shows the supported communication peripherals by the system bootloader.
06Y9
9''
670+
%227
N
Table 3. STM32H74xI/G and STM32H75xI/G bootloader communication peripherals
Bootloader peripherals Bootloader pins
DFU USB OTG FS (PA11/PA12) in device mode
USART1 PA9/PA10
USART2 PA2/PA3
USART3 PB10/PB11
CAN2 PB5/PB13
I2C1 PB6/PB9
I2C2 PF0/PF1
I2C3 PA8/PC9
I2C4 PD12/PD13
SPI1 PA4/PA5/PA6/PA7
SPI2 PI0/PI1/PI2/PI3
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