PM0068 datasheet(18/31 Pages) STMICROELECTRONICS

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Reading/programming the STM32F101xF/G and STM32F103xF/G embedded Flash memory

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Doc ID 17100 Rev 2

Table 5.

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 Flash bank to boot from: bank 1 or bank 2.

–

Select the watchdog event: Hardware or software.

–

Reset event when entering Stop mode.

–

Reset event when entering Standby mode.

Note: Only bits [19:16] are used, bits [23:20] are not used and set to 0xF.

Bit 19: BFB2 Boot from Flash memory bank 1 or bank 2

This bit allows to select the active Flash bank to boot from: bank 1 or bank 2.

0: The device boots from Flash memory bank 1 or bank 2, depending on the

activation of the bank. The active banks are checked in the following order:

bank 2, followed by bank 1. The active bank is identified by the value

programmed at the base address of the bank ( corresponding to the initial stack

pointer value in the interrupt vector table). Refer to application note AN2606 for

further details. In this case, the boot pins can only select user Flash or RAM

boot.

1: The device will boot from Flash memory bank 1 when boot pins are set in “boot

from user Flash” position (default).

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].)

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