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STM32U535NET6QTR 数据表(PDF) 24 Page - STMicroelectronics |
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STM32U535NET6QTR 数据表(HTML) 24 Page - STMicroelectronics |
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24 / 278 page ![]() Functional overview STM32U535xx 24/278 DS14217 Rev 1 Backup registers 1 Yes Yes N/A No No N/A(7) 2 Yes Yes N/A N/A N/A N/A SRAM2/backup RAM 1 Yes Yes N/A No No N/A(8) 2 Yes Yes N/A N/A N/A N/A 1. When the protection level 2 is active, the debug port, the boot from RAM and the boot from system memory are disabled. 2. The system memory is only read-accessible, whatever the protection level (0, 1 or 2) and execution mode. 3. Option bytes are only accessible through the flash memory registers and OPSTRT bit. 4. The flash main memory is erased when the RDP option byte changes from level 1 to level 0. 5. SWAP_BANK option bit can be modified. 6. OTP can only be written once. 7. The backup registers are erased when RDP changes from level 1 to level 0. 8. All SRAMs are erased when RDP changes from level 1 to level 0. Table 3. Access status versus protection level and execution modes when TZEN = 0 (continued) Area RDP level User execution (boot from flash memory) Debug/boot from RAM/ bootloader(1) Read Write Erase Read Write Erase Table 4. Access status versus protection level and execution modes when TZEN = 1 Area RDP level User execution (boot from flash memory) Debug/ bootloader(1) Read Write Erase Read Write Erase Flash main memory 0.5 Yes Yes Yes Yes(2) Yes(2) Yes(2) 1 Yes Yes Yes No No No(5) 2 Yes Yes Yes N/A N/A N/A System memory (3) 0.5 Yes No No Yes No No 1 Yes No No Yes No No 2 Yes No No N/A N/A N/A Option bytes(4) 0.5 Yes Yes(5) N/A Yes Yes (5) N/A 1Yes Yes(5) N/A Yes Yes(5) N/A 2Yes No(6) N/A N/A N/A N/A OTP 0.5 Yes Yes(7) N/A Yes Yes(7) N/A 1Yes Yes(7) N/A Yes Yes(7) N/A 2Yes Yes(7) N/A N/A N/A N/A |
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