STM32U5A5QJI datasheet(32/382 Pages) STMICROELECTRONICS

32 / 382 page

Functional overview

STM32U5Axxx

32/382

DS13543 Rev 1

The BOOT0 value comes from the PH3-BOOT0 pin or from an option bit depending on the

value of a user option bit to free the GPIO pad if needed.

The bootloader is located in the system memory, programmed by ST during production.

The bootloader is used to reprogram the flash memory by using USART, I2C, SPI, FDCAN

or USB OTG_HS in device mode through the DFU (device firmware upgrade).

The bootloader is available on all devices. Refer to the application note

STM32 microcontroller system memory boot mode (AN2606) for more details.

The RSS are embedded in a flash memory area named secure information block,

programmed during ST production.

For example, the RSS enable the SFI (secure firmware installation), thanks to the RSSe SFI

(RSS extension firmware).

This feature allows customer to produce the confidentiality of the firmware to be provisioned

into the STM32, when production is sub-contracted to untrusted third party.

The RSS are available on all devices, after enabling the TrustZone through the TZEN option

bit. Refer to the application note Overview secure firmware install (SFI) (AN4992)

for more details.

Refer to Table 6 and Table 7 for boot modes when TrustZone is disabled and

enabled respectively.

When TrustZone is enabled by setting the TZEN option bit, the boot space must be in the

secure area. The SECBOOTADD0[24:0] option bytes are used to select the boot secure

memory address.

A unique boot entry option can be selected by setting the BOOT_LOCK option bit, allowing

to boot always at the address selected by SECBOOTADD0[24:0] option bytes. All other boot

options are ignored.

Table 6. Boot modes when TrustZone is disabled (TZEN = 0)

nBOOT0

FLASH_

OPTR[27]

BOOT0

pin PH3

nSWBOOT0

FLASH_

OPTR[26]

Boot address

option-byte

selection

Boot area

ST programmed

default value

NSBOOTADD0[24:0]

Boot address defined by

user option bytes

NSBOOTADD0[24:0]

Flash: 0x0800 0000

NSBOOTADD1[24:0]

Boot address defined by

user option bytes

NSBOOTADD1[24:0]

Bootloader:

0x0BF9 0000

NSBOOTADD0[24:0]

Boot address defined by

user option bytes

NSBOOTADD0[24:0]

Flash: 0x0800 0000

NSBOOTADD1[24:0]

Boot address defined by

user option bytes

NSBOOTADD1[24:0]

Bootloader:

0x0BF9 0000

STM32U5A5QJI Datasheet(PDF) 32 Page - STMicroelectronics

STM32U5A5QJI Datasheet(HTML) 32 Page - STMicroelectronics

Html Pages

1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 ...More

Datasheet Download

Link URL