PM0068 datasheet(25/31 Pages) STMICROELECTRONICS

25 / 31 page

PM0068

Doc ID 17100 Rev 2

25/31

3.8

Write protection register (FLASH_WRPR)

Address offset: 0x20

Reset value: 0xFFFF FFFF

3.9

FPEC key register2 (FLASH_KEYR2)

This register is dedicated to Flash memory bank 2.

Address offset: 0x44

Reset value: xxxx xxxx

Note:

These bits are all write-only and will return a 0 when read.

Bits 9:2 USER: User option bytes

This contains the user option byte loaded by the OBL.

Bits [9:6]: Not used (if these bits are written in the Flash option byte, they will be read in this

Bit 5: BFB2

Bit 4: nRST_STDBY

Bit 3: nRST_STOP

Bit 2: WDG_SW

Bit 1 RDPRT: Read protection

When set, this indicates that the Flash memory is read-protected.

Note: This bit is read-only.

Bit 0 OPTERR: Option byte error

When set, this indicates that the loaded option byte and its complement do not match. The

corresponding byte and its complement are read as 0xFF in the FLASH_OBR or

FLASH_WRPR register.

Note: This bit is read-only.

WRP[31:16]

WRP[15:0]

Bits 31:0 WRP: Write protect

This register contains the write-protection option bytes loaded by the OBL.

0: Write protection active

1: Write protection not active

Note: These bits are read-only.

FKEYR[31:16]

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FKEYR[15:0]

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PM0068 Datasheet(PDF) 25 Page - STMicroelectronics