ST10F271Z1 datasheet(35/185 Pages) STMICROELECTRONICS

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ST10F271Z1

Internal Flash memory

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5.5

Protection strategy

The protection bits are stored in non-volatile Flash cells inside IFlash module, that are read

once at reset and stored in 4 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 itself.

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.

5.5.1

Protection registers

The 4 non-volatile protection registers are one time programmable for the user.

One register (FNVWPIR) is used to store the write protection fuses respectively for each

sector IFlash module. The other three registers (FNVAPR0 and FNVAPR1L/H) are used to

store the access protection fuses.

5.5.2

Flash non-volatile write protection I register

5.5.3

Flash non-volatile access protection register 0

FNVWPIR (0x08 DFB0)

NVR

Reset value: FFFFh

987

65432

reserved

W0P7W0P6W0P5W0P4W0P3W0P2W0P1W0P0

Table 19.

Flash non-volatile write protection I register

Bit

Function

W0P(9:0)

Write protection bank 0 / sectors 9-0 (IFlash)

These bits, if programmed at 0, disable any write access to the sectors of bank 0

(IFlash)

FNVAPR0 (0x08 DFB8)

NVR

Reset value: ACFFh

987

65432

reserved

DBGP ACCP

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