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ST10F272Z2 Datasheet(PDF) 39 Page - STMicroelectronics |
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ST10F272Z2 Datasheet(HTML) 39 Page - STMicroelectronics |
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39 / 189 page  ST10F272Z2 Internal Flash memory 39/189 5.5.5 Flash non-volatile access protection register 1 high 5.5.6 XBus flash volatile temporary access unprotection register (XFVTAUR0) 5.5.7 Access protection The I-Flash module has one level of access protection (access to data both in Reading and Writing): if bit ACCP of FNVAPR0 is programmed at 0 and bit TAUB in XFVTAUR0 is set at 0, the I-Flash module becomes access protected: data in the I-Flash module can be read only if the current execution is from the I-Flash module itself. To enable Access Protection, the following sequence of operations is recommended: ● execution from external memory or internal Rams ● program TAUB bit at 1 in XFVTAUR0 register ● program ACCP bit in FNVAPR0 to 0 using Set Protection operation ● program TAUB bit at 0 in XFVTAUR0 register ● Access Protection is active when both ACCP bit and TAUB bit are set to 0. Protection can be permanently disabled by programming bit PDS0 of FNVAPR1H, in order to analyze rejects. Protection can be permanently enabled again by programming bit PEN0 of FNVAPR1L. The action to disable and enable again Access Protections in a permanent FNVAPR1H (0x08 DFBE) NVR Delivery value: FFFFh 15 14 13 12 11 10 987 65432 10 PEN15PEN14PEN13PEN12PEN11PEN10 PEN9 PEN8 PEN7 PEN6 PEN5 PEN4 PEN3 PEN2 PEN1 PEN0 RW RW RW RW RW RW RW RW RW RW RW RW RW RW RW RW Table 23. Flash non-volatile access protection register 1 high Bit Function PEN15-0 Protections Enable 15-0 If bit PENx is programmed at 0 and bit PDSx+1 is erased at 1, the action of bit ACCP is enabled again. Bit PENx can be programmed at 0 only if bit PDSx has already been programmed at 0. XFVTAUR0 (0x00 EB50) NVR Reset value: 0000h 15 14 13 12 11 10 987 65432 10 TAUB reserved RW Table 24. XBus flash volatile temporary access unprotection register Bit Function TAUB Temporary Access Unprotection bit If this bit is set to 1, the Access Protection is temporary disabled. This bit can be written only executing from IFlash.This fact guarantees that only a code executed in IFlash, can unprotect the IFlash, when it is Access Protected. |
Similar Part No. - ST10F272Z2_08 |
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Similar Description - ST10F272Z2_08 |
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