STLUX385ATR datasheet(56/99 Pages) STMICROELECTRONICS

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Option bytes

STLUX385A

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DocID024387 Rev 2

8.2

Option byte register description

The option byte registers are mapped inside the E²PROM data region.

ROP (memory read-out protection register)

Bit 7-0:

ROP[7:0] memory read-out protection:

0xAA: enable read-out protection. When read-out protection is enabled, reading or

modifying the Flash program memory and DATA area in ICP mode (using the SWIM

interface) is forbidden, whatever the write protection settings are.

UBC (UBC user boot code reg.)

Bit 7-0:

UBC[7:0] user boot code write protection memory size:

0x00: no UBC, no Flash memory write-protection

0x01: pages 0 to 1 defined as UBC; 1 Kbyte memory write-protected (0x00.8000-

0x00.83FF)

0x02: pages 0 to 3 defined as UBC; 2 Kbyte memory write-protected (0x00.8000-

0x00.87FF)

0x03: pages 0 to 4 defined as UBC; 2.5 Kbyte memory write-protected (0x00.8000-

0x00.89FF)

...

0x3E: pages 0 to 63 defined as UBC; 32 Kbyte memory write-protected (0x00.8000-

0x00.FFFF)

Other values: reserved

Offset: 0x004800

Default value: 0x00

6543

210

ROP [7:0]

r/w

Offset: 0x004801

Default value: 0x00

6543

210

UBC [7:0]

r/w

STLUX385ATR 数据表(PDF) 56 Page - STMicroelectronics

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