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ST10F276R-6QR3 Datasheet(PDF) 37 Page - STMicroelectronics |
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ST10F276R-6QR3 Datasheet(HTML) 37 Page - STMicroelectronics |
37 / 235 page ST10F276E Internal Flash memory Doc ID 12303 Rev 3 37/235 4.4 Protection strategy The protection bits are stored in non-volatile Flash cells inside XFLASH module, that are read once at reset and stored in 7 Volatile registers. Before they are read from the non- volatile cells, all the available protections are forced active during reset. The protections can be programmed using the Set Protection operation (see Flash Control Registers paragraph), that can be executed from all the internal or external memories except from the Flash Bank B2. Two kind of protections are available: write protections to avoid unwanted writings and access protections to avoid piracy. In next paragraphs all different level of protections are shown, and architecture limitations are highlighted as well. 4.4.1 Protection registers The seven non-volatile protection registers are one time programmable for the user. Four registers (FNVWPXRL/H-FNVWPIRL/H) are used to store the Write Protection fuses respectively for each sector of the XFLASH Module (see X) and IFLASH module (see I). The other three Registers (FNVAPR0 and FNVAPR1L/H) are used to store the Access Protection fuses (common to both Flash modules even though with some limitations). 4.4.2 Flash non-volatile write protection X register low FNVWPXRL (0x0E DFB0) NVR Delivery value: FFFFh 15 14 13 12 11 10 98 765 43 210 W2PPR Reserved W2P2 W2P1W2P0 RW RW RW RW Table 19. Flash non-volatile write protection X register low Bit Function W2P(2:0) Write Protection Bank 2 sectors 2-0 (XFLASH) These bits, if programmed at 0, disable any write access to the sectors of Bank 2 (XFLASH). W2PPR Write Protection Bank 2 non-volatile cells This bit, if programmed at 0, disables any write access to the non-volatile cells of Bank 2. Since these non-volatile cells are dedicated to Protection registers, once W2PPR bit is set, the configuration of protection setting is frozen, and can only be modified executing a Temporary Write Unprotection operation. |
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