Flash Status Register (Flash_Sr) - STMicroelectronics STM32WLEx Reference Manual

RM0461
3.8.4

FLASH status register (FLASH_SR)

Address offset: 0x010
Reset value: 0x000X 0000
31 30 29
Res. Res. Res. Res.
15 14 13
OPTNV Res.
rc_w1 rc_w1 r
Bits 31:20 Reserved, must be kept at reset value.
Bit 19 PESD: Program/erase operation suspended
Bit 18 CFGBSY: Program or erase configuration busy
Bit 17 Reserved, must be kept at reset value.
Bit 16 BSY: Busy
Bit 15 OPTVERR: Option and engineering bits loading validity error
Bit 14 RDERR: PCROP read error
28 27 26 25
Res. Res. Res.
12 11 10 9
Res. Res.
rc_w1
This bit is set and reset by hardware.
Set when PES bit in FLASH_ACR is set.
Cleared when PES bitin FLASH_ACRis cleared.
When set, new program or erase operations are not started.
This bit is set and reset by hardware (set when first word is sent and reset when program
operation completes or is interrupted by an error).
When set, the program and erase settings in PG, PNB[6:0], PER, and MER bits in
FLASH_CR are used (busy) and cannot be changed (a programming or erase operation is
ongoing).
When reset, the program and erase settings in PG, PNB[6:0], PER, and MER bits in
FLASH_CR can be modified.
This bit indicates that a flash operation requested in FLASH_CR is in progress. This bit is set
at the beginning of a flash operation and reset when the operation finishes or when an error
occurs.
Set by hardware when the options and engineering bits read may not be the one configured
by the user or production. If options and engineering bits are not properly loaded, OPTVERR
is set again after each system reset. Option bytes that fail loading are forced to a safe value
(see Section 3.4.2: Option bytes
This bit is cleared by writing 1.
Set by hardware when an address to be read through the D-bus belongs to a read protected
area of the flash memory (PCROP protection). An interrupt is generated if RDERRIE is set in
FLASH_CR.
This bit is cleared by writing 1.
24 23 22 21
Res. Res. Res. Res.
8 7 6
rc_w1 rc_w1 rc_w1 rc_w1
programming).
RM0461 Rev 5
Embedded flash memory (FLASH)
20 19 18
Res. PESD CFGBSY
r r
5 4 3 2
Res.
rc_w1 rc_w1
17 16
Res. BSY
r
1 0
EOP
rc_w1 rc_w1
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