ST STM32F301 6 Series Reference Manual page 65

RM0366
4 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.
Complemented option
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
byte register (FLASH_OBR).
Note: The new programmed option bytes (user, read/write protection) are loaded after a system
reset.
Address
0x1FFF F800
0x1FFF F804
0x1FFF F808
31-24
Option byte 1
byte1
Table 9. Option byte organization
[31:24]
nUSER
nData1
nWRP1
Table 8. Option byte format
23-16
Complemented option
[23:16]
USER
Data1
WRP1
RM0366 Rev 5
Option byte description
15 -8
Option byte 0
byte0
Table
Table 9 or from the Option
[15:8]
nRDP
nData0
nWRP0
7-0
9.
[7:0]
RDP
Data0
WRP0
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