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STM32U545NET3QTR Datasheet(PDF) 30 Page - STMicroelectronics

Part # STM32U545NET3QTR
Description  Ultra-low-power Arm® Cortex®-M33 MCUTrustZone®FPU,240 DMIPS, 512 KB flash memory, 274 KB SRAM, crypto
PDF  283 Pages
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Manufacturer  STMICROELECTRONICS [STMicroelectronics]
Direct Link  http://www.st.com
Logo STMICROELECTRONICS - STMicroelectronics

STM32U545NET3QTR Datasheet(HTML) 30 Page - STMicroelectronics

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Functional overview
STM32U545xx
30/283
DS14216 Rev 1
The boot address option bytes allow any boot memory address to be programmed.
However, the allowed address space depends on the flash memory RDP level.
If the programmed boot memory address is out of the allowed memory mapped area when
RDP level is 0.5 or more, the default boot address is forced either in secure flash memory or
nonsecure flash memory, depending on TrustZone security option as described in the table
below.
Table 7. Boot modes when TrustZone is enabled (TZEN = 1)
BOOT_
LOCK
NBOOT0
FLASH_
OPTR[27]
BOOT0
pin
PH3
NSWBOOT0
FLASH_
OPTR[26]
RSS
com-
mand
Boot address
option-bytes
selection
Boot area
ST pro-
grammed
default value
0
-0
1
0
SECBOOTADD0
[24:0]
Secure boot address
defined by user
option bytes
SECBOOTADD0[24:0]
Flash:
0x0C00 0000
-1
1
0
N/A
RSS
RSS:
0x0FF8 0000
1-
0
0
SECBOOTADD0
[24:0]
Secure boot address
defined by user
option bytes
SECBOOTADD0[24:0]
Flash:
0x0C00 0000
0-
0
0
N/A
RSS
RSS:
0x0FF8 0000
--
-
≠0N/A
RSS
RSS:
0x0FF8 0000
1-
-
-
-
SECBOOTADD0
[24:0]
Secure boot address
defined by user
option bytes
SECBOOTADD0[24:0]
Flash:
0x0C00 0000
Table 8. Boot space versus RDP protection
RDP
TZEN = 1
TZEN = 0
0
Any boot address
Any boot address
0.5
Boot address only in RSS or secure flash memory:
0x0C00 0000 - 0x0C07 FFFF
Otherwise, forced boot address is 0x0FF8 0000.
N/A
1
Any boot address
2
Boot address only in flash memory
0x0800 0000 - 0x0807 FFFF
Otherwise, forced boot address is 0x0800 0000.



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