Table 119. Rng Configurations - STMicroelectronics STM32WLEx Reference Manual

True random number generator (RNG)
RNG
Config.
A
B
1. When writing this register magic number 0x17590ABC must be written immediately before the indicated
value
2. Corresponds to 42 for repetition tests and 628 for adaptive tests. See
details
20.6.3 Data collection
In order to run statistical tests it is required to collect samples from the entropy source at raw
data level as well as at the output of the entropy source. For details on data collection and
the running of statistical test suites refer to "STM32 microcontrollers random number
generation validation using NIST statistical test suite" application note (AN4230) available
from www.st.com.
Contact STMicroelectronics if above samples need to be retrieved for the product.
20.7 RNG registers
The RNG is associated with a control register, a data register and a status register.
20.7.1 RNG control register (RNG_CR)
Address offset: 0x000
Reset value: 0x0080 0000
31 30 29
CONFI COND
Res. Res.
GLOCK RST
rs rw
15 14 13
RNG_CONFIG2[2:0] NISTC
rw rw rw
538/1306

Table 119. RNG configurations

RNG_
NISTC CLKDIV
CONFIG1
bit
[5:0]
0 0x0F
1 0x18
28 27 26 25
Res. Res.
rw
12 11 10 9
RNG_CONFIG3[3:0]
rw rw rw rw
RNG_CR bits
RNG_
CONFIG2 CONFIG3
[3:0]
[2:0]
0x0 0x0
0x0 0x0
24 23 22
RNG_CONFIG1[5:0]
rw rw rw
8 7 6
Res. Res.
rw
RM0461 Rev 5
Loop
RNG_
number
CED
(N)
bit
[3:0]
0xD 0 2
0x0 0 1
Health checks on page 532
21 20 19 18
CLKDIV[3:0]
rw rw rw rw
5 4 3 2
CED Res. IE RNGEN
rw rw rw
RM0461
RNG_
HTCR
(1)
register
0x0000
(2)
AA74
0x0000
AA74
for
17 16
rw rw
1 0
Res. Res.