Option Byte Description; Table 9. Option Byte Format; Table 10. Option Byte Organization - STMicroelectronics STM32F05 series Reference Manual

RM0091
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Option byte description

There are six option bytes. They are configured by the end user depending on the
application requirements. As a configuration example, the watchdog may be selected in
hardware or software mode.
A 32-bit word is split up as follows in the option bytes.
Table 9.
Complemented
option byte 1
The organization of these bytes inside the information block is as shown in
The option bytes can be read from the memory locations listed in
Option byte register (FLASH_OBR).
Note: The new programmed option bytes (user, read/write protection) are loaded after a system
reset.
Table 10.
Address
0x1FFF F800
0x1FFF F804
0x1FFF F808
Option byte format
31-24
Option byte 1
Option byte organization
[31:24]
nUSER
nData1
nWRP1
Doc ID 018940 Rev 1
23-16
Complemented
option byte 0
[23:16]
USER
Data1
WRP1
Option byte description
15 -8
Option byte 0
Table
Table 10 or from the
[15:8]
nRDP
nData0
nWRP0
7-0
10.
[7:0]
RDP
Data0
WRP0
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