Table 132. Rng Register Map And Reset Map - STMicroelectronics STM32WL5 Series Reference Manual

True random number generator (RNG)
22.7.4 RNG health test control register (RNG_HTCR)
Address offset: 0x010
Reset value: 0x0000 5A4E
Writing in RNG_HTCR is taken into account only if the CONDRST bit is set, and the
CONFIGLOCK bit is cleared in the RNG_CR. Writing to this register is ignored if
CONFIGLOCK=1.
31 30 29
rw rw rw
15 14 13
rw rw rw
Bits 31:0 HTCFG[31:0]: health test configuration
Note: The RNG behavior, including the read to this register, is not guaranteed if a different
22.7.5 RNG register map
Offset Register name
RNG_CR
0x000
Reset value
RNG_SR
0x004
Reset value
RNG_DR
0x008
Reset value
RNG_HTCR
0x010
Reset value
Refer to
646/1450
28 27 26 25
rw rw rw rw
12 11 10 9
rw rw rw rw
This configuration is used by RNG to configure the health tests. See
entropy source validation
value from the recommended value is written.
When reading or writing this register magic number; 0x17590ABC must be written
immediately before to the RNG_HTCR register.

Table 132. RNG register map and reset map

RNG_CONFIG1[5:0]
0 0 0 0
0 0 0 0 0 0 0 0
0 0 0 0 0 0 0 0
Section 2.6 for the register boundary addresses.
24 23 22
HTCFG[31:16]
rw rw rw
8 7 6
HTCFG[15:0]
rw rw rw
for the recommended value.
RNG_
.CLKDIV
CONFIG2
[3:0]
1 0 0 0 0 0 0 0 0
RNDATA[31:0]
0 0 0 0 0 0 0 0 0
HTCFG[31:0]
0 0 0 0 1 1 0 0 0
RM0453 Rev 5
21 20 19
rw rw rw
5 4 3
rw rw rw
Section 22.6: RNG
RNG_
CONFIG3
[2:0] [3:0]
0 0 0 0 0 0 0
0 0 0 0 0 0 0 0
1 0 1 1 0 1 0 0
RM0453
18 17 16
rw rw rw
2 1 0
rw rw rw
0 0 0
0 0 0 0 0
0 0 0 0 0 0 0
1 0 0 1 1 1 0