STMicroelectronics STM32WL5 Series User Manual

RM0453 Rev 5 149/1450
RM0453 Embedded flash memory (FLASH)
154
4.10.19 FLASH secure flash start address register (FLASH_SFR)
Address offset: 0x080
Reset value: 0xFFFF EFFF
Default reset value from ST production is given as 0bX111 1111 XXXX XXXX 111X 1111
XXXX XXXX, the option bits are loaded with user values from the flash memory at power-on
reset release.
When the system is secure (ESE = 1), this register provides write access security and can
only be written by the CPU2. A write access from the CPU1 is ignored and an illegal access
event is generated. On any read access the register value is returned.
When the system is secure (ESE = 1), this register is further more protected by the
PRIVMODE. When privilege protection is enabled in PRIVMODE, this register provides
write access privilege and can only be written by a privileged access. Unprivileged write
access from is ignored and an illegal access event is generated. Unprivileged read access
is still allowed.
This register, except for the DDS bit, is further write protected by HDPADIS, when
HDPAD = 0. The write protected bits can only be written when HDPADIS = 0. When
HDPADIS = 1, write access is ignored. Read access returns register data.
Written values are only taken into account after OBL.
There are no read restrictions.
Bit 1 PER: page erase
0: page erase disabled
1: page erase enabled
Bit 0 PG: programming
0: Flash programming disabled
1: Flash programming enabled
31 30 29 28 27 26 25 24 23 22 21 20 19 18 17 16
SUBGHSPISD
Res. Res. Res. Res. Res. Res. Res. HDPAD HDPSA[6:0]
rw rw rw rw rw rw rw rw rw
15 14 13 12 11 10 9 8 7 6 5 4 3 2 1 0
Res. Res. Res. DDS Res. Res. Res. Res. FSD SFSA[6:0]
rw rw rw rw rw rw rw rw rw
Bit 31 SUBGHSPISD: sub-GHz radio SPI security disable
When FSD = 1, the sub-GHz radio SPI security is disabled whatever the value of this
SUBGHSPISD bit.
This bit is write protected when HDPAD = 0 and HDPADIS = 1.
0 (and FSD = 0): sub-GHz radio SPI security enabled
1 (and FSD = 0): sub-GHz radio SPI security disabled
Bits 30:24 Reserved, must be kept at reset value.

STMicroelectronics STM32WL5 Series Specifications

General

Brand	STMicroelectronics
Model	STM32WL5 Series
Category	Microcontrollers
Language	English