DocID024597 Rev 3 99/1693
RM0351 Embedded Flash memory (FLASH)
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During option byte loading, the options are read by double word with ECC. If the word and
its complement are matching, the option word/byte is copied into the option register.
If the comparison between the word and its complement fails, a status bit OPTVERR is set.
Mismatch values are forced into the option registers:
– For USR OPT option, the value of mismatch is all options at ‘1’, except for
BOR_LEV which is “000” (lowest threshold)
– For WRP option, the value of mismatch is the default value “No protection”
– For RDP option, the value of mismatch is the default value “Level 1”
– For PCROP, the value of mismatch is “all memory protected”
On system reset rising, internal option registers are copied into option registers which can
be read and written by software (
FLASH_OPTR, FLASH_PCROP1/2SR,
FLASH_PCROP1/2ER, FLASH_WRP1/2AR, FLASH_WRP1/2BR).
These registers
are also used to modify options. I
f these registers are not modified by user, they
reflects the options states of the system
. See Section : Modifying user options for more
details.
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