PM0075 datasheet(21/31 Pages) STMICROELECTRONICS

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PM0075

Reading/programming the embedded Flash memory

Doc ID 17863 Rev 2

21/31

0x1FFF F80C

WRPx: Flash memory write protection option bytes

Bits [31:24]: nWRP3

Bits [23:16]: WRP3 (stored in FLASH_WRPR[31:24])

Bits [15:8]: nWRP2

Bits [7:0]: WRP2 (stored in FLASH_WRPR[23:16])

●

For low-density devices, one bit of the user option bytes WRPx is used to

protect 4 pages of 1 Kbyte in main memory block.

–

0: Write protection active

–

1: Write protection not active

In total, one user option byte is used to protect the 32-Kbyte main Flash memory.

WRP0: Write-protects pages 0 to 31

●

For medium-density devices, one bit of the user option bytes WRPx is used to

protect 4 pages of 1 Kbyte in main memory block.

–

0: Write protection active

–

1: Write protection not active

In total, four user option bytes are used to protect the 128-Kbyte main Flash

memory.

WRP0: Write-protects pages 0 to 31

WRP1: Write-protects pages 32 to 63

WRP2: Write-protects pages 64 to 95

WRP3: Write-protects pages 96 to 127

●

For high-density devices, one bit of the user option bytes WRPx is used to

protect 2 pages of 2 Kbytes in main memory block. However, the bit 7 of

WRP3 write protects pages 62 to 255.

–

0: Write protection active

–

1: Write protection not active

In total, four user option bytes are used to protect the 512-Kbyte main Flash

memory.

WRP0: Write-protects pages 0 to 15.

WRP1: Write-protects pages 16 to 31.

WRP2: Write-protects pages 32 to 47.

WRP3: bits 0-6 write-protect pages 48 to 61

bit 7 write-protects pages 62 to 255.

●

For connectivity line devices, one bit of the user option bytes WRPx is used to

protect 2 pages of 2 Kbytes in main memory block. However, the bit 7 of

WRP3 write-protects pages 62 to 127.

–

0: Write protection active

–

1: Write protection not active

In total, four user option bytes are used to protect the 256-Kbyte main Flash

memory.

WRP0: Write-protects pages 0 to 15.

WRP1: Write-protects pages 16 to 31.

WRP2: Write-protects pages 32 to 47.

WRP3: bits 0-6 write-protect pages 48 to 61

bit 7 write-protects pages 62 to 127.

Table 9.

Description of the option bytes (continued)

Flash memory

address

Option bytes

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