Gtzc Tzsc Privileged Configuration Register (Gtzc_Tzsc_Privcfgr1) - ST STM32WL55JC Reference Manual

Global security controller (GTZC)
3.5.5 GTZC TZSC unprivileged writable watermark 1 register
(GTZC_TZSC_MPCWM1_UPWWMR)
Address offset: 0x134
Reset value: 0x0FFF 0000
Privileged write access only.
This register can be written only by secure privileged transaction when the corresponding
Flash user option FSD is configured as secure. If non-secure, this register can be written by
secure privileged and non-secure privileged transaction.
Read access is authorized for any type of transaction, secure/non-secure,
privileged/unprivileged.
When TZSC configuration is locked in GTZC_TZSC_CR.LCK, this register cannot be
modified.
Note: When the system is non-secure (ESE = 0), this register can be written and read, however
bits have no function.
31 30 29
Res. Res. Res. Res.
15 14 13
Res. Res. Res. Res.
Bits 31:28 Reserved, must be kept at reset value.
Bits 27:16 LGTH[11:0]: Define the length of Flash unprivileged writable area (in 2-Kbyte resolution,
starting from the user Flash base address)
Note: This register has only effect when security is enabled (ESE = 1). When security is
Note: 0x800 and greater are truncated to 0x800
Bits 15:0 Reserved, must be kept at reset value.
88/1454
28 27 26 25
rw rw rw
12 11 10 9
Res. Res. Res.
Only the area which is also defined as unprivileged in
GTZC_TZSC_MPCWM1_UPWMR.LGTH[11;0] is unprivileged writable.
disabled, the memory is completely unprivileged writable, whatever the value.
0x000: No unprivileged writable area, privileged and unprivileged read execute 0x00000 to
0x3FFFF
0x001: Unprivileged writable 0x00000 to 0x007FF, privileged and unprivileged read execute
0x00800 to 0x3FFFF
0x002: Unprivileged writable 0x00000 to 0x00FFF, privileged and unprivileged read execute
0x01000 to 0x3FFFF
0x003: Unprivileged writable 0x00000 to 0x017FF, privileged and unprivileged read execute
0x01800 to 0x3FFFF
.....
0x080 and greater: Unprivileged writable 0x00000 to 0x3FFFF, no privileged and
unprivileged read execute area
24 23 22
LGTH[11:0]
rw rw rw
8 7 6
Res. Res. Res.
RM0453 Rev 2
21 20 19 18
rw rw rw rw
5 4 3 2
Res. Res. Res. Res.
RM0453
17 16
rw rw
1 0
Res. Res.