RM0091 Option byte description
Doc ID 018940 Rev 1 59/742
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.
The organization of these bytes inside the information block is as shown in Tabl e 10 .
The option bytes can be read from the memory locations listed in Tab l e 1 0 or from the
Option byte register (FLASH_OBR).
Note: The new programmed option bytes (user, read/write protection) are loaded after a system
reset.
Table 9. Option byte format
31-24 23-16 15 -8 7-0
Complemented
option byte 1
Option byte 1
Complemented
option byte 0
Option byte 0
Table 10. 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
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