NRF52810-QCAA-R7 datasheet(319/483 Pages) NORDIC

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Peripherals

The RNG is started by triggering the START task and stopped by triggering the STOP task. When started,

new random numbers are generated continuously and written to the VALUE register when ready. A

VALRDY event is generated for every new random number that is written to the VALUE register. This means

that after a VALRDY event is generated the CPU has the time until the next VALRDY event to read out the

random number from the VALUE register before it is overwritten by a new random number.

6.15.1 Bias correction

A bias correction algorithm is employed on the internal bit stream to remove any bias toward '1' or '0'. The

bits are then queued into an eight-bit register for parallel readout from the VALUE register.

It is possible to enable bias correction in the CONFIG register. This will result in slower value generation,

but will ensure a statistically uniform distribution of the random values.

6.15.2 Speed

The time needed to generate one random byte of data is unpredictable, and may vary from one byte to

the next. This is especially true when bias correction is enabled.

6.15.3 Registers

Base address

Peripheral

Instance

Description

Configuration

0x4000D000

RNG

Random number generator

Table 62: Instances

Offset

Description

TASKS_START

0x000

Task starting the random number generator

TASKS_STOP

0x004

Task stopping the random number generator

EVENTS_VALRDY

0x100

Event being generated for every new random number written to the VALUE register

SHORTS

0x200

Shortcut register

INTENSET

0x304

Enable interrupt

INTENCLR

0x308

Disable interrupt

CONFIG

0x504

Configuration register

VALUE

0x508

Output random number

Table 63: Register Overview

6.15.3.1 SHORTS

Address offset: 0x200

Shortcut register

Bit number

31 30 29 28 27 26 25 24 23 22 21 20 19 18 17 16 15 14 13 12 11 10 9 8 7 6 5 4 3 2 1 0

Reset 0x00000000

0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0

RW Field

Value Id

Value

Description

RW VALRDY_STOP

Shortcut between VALRDY event and STOP task

See EVENTS_VALRDY and TASKS_STOP

Disabled

Disable shortcut

Enabled

Enable shortcut

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