ST STM32L4x6 Reference Manual page 109

RM0351
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Bits 31:17 Reserved, must be kept at reset value.
Bits 13:10 Reserved, must be kept at reset value.
Bit 16 BSY: Busy
This indicates that a Flash operation is in progress. This is set on the beginning
of a Flash operation and reset when the operation finishes or when an error
occurs.
Bit 15 OPTVERR: Option validity error
Set by hardware when the options read may not be the one configured by the
user. If option haven't been properly loaded, OPTVERR is set again after each
system reset.
Cleared by writing 1.
Bit 14 RDERR: PCROP read error
Set by hardware when an address to be read through the D-bus belongs to a
read protected area of the flash (PCROP protection). An interrupt is generated if
RDERRIE is set in FLASH_CR.
Cleared by writing 1.
Bit 9 FASTERR: Fast programming error
Set by hardware when a fast programming sequence (activated by FSTPG) is
interrupted due to an error (alignment, size, write protection or data miss). The
corresponding status bit (PGAERR, SIZERR, WRPERR or MISSERR) is set at
the same time.
Cleared by writing 1.
Bit 8 MISERR: Fast programming data miss error
In Fast programming mode, 32 double words must be sent to flash successively,
and the new data must be sent to the flash logic control before the current data is
fully programmed. MISSERR is set by hardware when the new data is not
present in time.
Cleared by writing 1.
Bit 7 PGSERR: Programming sequence error
Set by hardware when a write access to the Flash memory is performed by the
code while PG or FSTPG have not been set previously. Set also by hardware
when PROGERR, SIZERR, PGAERR, WRPERR, MISSERR or FASTERR is set
due to a previous programming error.
Cleared by writing 1.
Bit 6 SIZERR: Size error
Set by hardware when the size of the access is a byte or half-word during a
program or a fast program sequence. Only double word programming is allowed
(consequently: word access).
Cleared by writing 1.
Bit 5 PGAERR: Programming alignment error
Set by hardware when the data to program cannot be contained in the same 64-
bit Flash memory row in case of standard programming, or if there is a change of
page during fast programming.
Cleared by writing 1.
Bit 4 WRPERR: Write protection error
Set by hardware when an address to be erased/programmed belongs to a write-
protected part (by WRP, PCROP or RDP level 1) of the Flash memory.
Cleared by writing 1.
DocID024597 Rev 3
Embedded Flash memory (FLASH)
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