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STM32L552CCT3PTR Datasheet(PDF) 25 Page - STMicroelectronics |
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STM32L552CCT3PTR Datasheet(HTML) 25 Page - STMicroelectronics |
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25 / 340 page ![]() DS12737 Rev 6 25/340 STM32L552xx Functional overview 78 The boot address option bytes enables the possibility to program any boot memory address. However, the allowed address space depends on Flash read protection 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 fetch address is forced to: • 0x0800 0000 (when TZEN = 0) • RSS (when TZEN = 1) Refer to Table 5. Table 4. Boot modes when TrustZone is enabled (TZEN=1) BOOT_ LOCK nBOOT0 FLASH_ OPTR[27] BOOT0 pin PH3 nSWBOOT0 FLASH_ OPTR[26] RSS command Boot address option-bytes selection Boot area ST programmed default value 0 -0 1 0 SECBOOTAD D0[24:0] Secure boot address defined by user option bytes SECBOOTADD0[24:0] Flash: 0x0C00 0000 - 1 1 0 N/A RSS: 0x0FF8 0000 RSS: 0x0FF8 0000 1- 0 0 SECBOOTAD D0[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 RSS: 0x0FF8 0000 -- - ≠ 0N/A RSS: RSS: 0x0FF8 0000 RSS: 0x0FF8 0000 1- - - - SECBOOTAD D0[24:0] Secure boot address defined by user option bytes SECBOOTADD0[24:0] Flash: 0x0C00 0000 Table 5. Boot space versus RDP protection RDP TZEN = 1 TZEN = 0 0 Any boot address Any boot address |
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