PM0075 datasheet(20/31 Pages) STMICROELECTRONICS

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Reading/programming the embedded Flash memory

PM0075

20/31

Doc ID 17863 Rev 2

Table 8.

Option byte organization

Address

[31:24]

[23:16]

[15:8]

[7:0]

0x1FFF F800

nUSER

USER

nRDP

RDP

0x1FFF F804

nData1

Data1

nData0

Data0

0x1FFF F808

nWRP1

WRP1

nWRP0

WRP0

0x1FFF F80C

nWRP3

WRP3

nWRP2

WRP2

Table 9.

Description of the option bytes

Flash memory

address

Option bytes

0x1FFF F800

Bits [31:24] nUSER

Bits [23:16] USER: User option byte (stored in FLASH_OBR[9:2])

This byte is used to configure the following features:

–

Select the watchdog event: Hardware or software.

–

Reset event when entering Stop mode.

–

Reset event when entering Standby mode.

Note: Only bits [16:18] are used, bits [23:19]: 0x1F are not used.

Bit 18: nRST_STDBY

0: Reset generated when entering Standby mode.

1: No reset generated.

Bit 17: nRST_STOP

0: Reset generated when entering Stop mode

1: No reset generated

Bit 16: WDG_SW

0: Hardware watchdog

1: Software watchdog

Bits [15:8]: nRDP

Bits [7:0]: RDP: Read protection option byte

The read protection helps the user protect the software code stored in Flash

memory. It is activated by setting the RDP option byte.

When this option byte is programmed to a correct value (RDPRT key = 0x00A5),

read access to the Flash memory is allowed.

(The result of RDP level enabled/disabled is stored in FLASH_OBR[1].)

0x1FFF F804

Datax: Two bytes for user data storage.

These addresses can be programmed using the option byte programming

procedure.

Bits [31:24]: nData1

Bits [23:16]: Data1 (stored in FLASH_OBR[25:18])

Bits [15:8]: nData0

Bits [7:0]: Data0 (stored in FLASH_OBR[17:10])

0x1FFF F808

WRPx: Flash memory write protection option bytes

Bits [31:24]: nWRP1

Bits [23:16]: WRP1 (stored in FLASH_WRPR[15:8])

Bits [15:8]: nWRP0

Bits [7:0]: WRP0 (stored in FLASH_WRPR[7:0])

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