NRF52810-QFAA-R datasheet(321/483 Pages) NORDIC

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Peripherals

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

A A A A A A A A

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

VALUE

[0..255]

Generated random number

6.15.4 Electrical specification

6.15.4.1 RNG Electrical Specification

Symbol

Description

Min.

Typ.

Max.

Units

tRNG,START

Time from setting the START task to generation begins.

This is a one-time delay on START signal and does not apply

between samples.

128

µs

tRNG,RAW

Run time per byte without bias correction. Uniform

distribution of 0 and 1 is not guaranteed.

µs

tRNG,BC

Run time per byte with bias correction. Uniform distribution

of 0 and 1 is guaranteed. Time to generate a byte cannot be

guaranteed.

120

µs

6.16 RTC — Real-time counter

The Real-time counter (RTC) module provides a generic, low power timer on the low-frequency clock

source (LFCLK).

RTC

32.768 kHz

CC[0:3]

PRESCALER

COUNTER

task

CLEAR

task

TRIGOVRFLW

event

TICK

event

OVRFLW

event

COMPARE[0..N]

task

START

task

STOP

Figure 75: RTC block schematic

The RTC module features a 24-bit COUNTER, a 12-bit (1/X) prescaler, capture/compare registers, and a tick

event generator for low power, tickless RTOS implementation.

6.16.1 Clock source

The RTC will run off the LFCLK.

The COUNTER resolution will therefore be 30.517 μs. Depending on the source, the RTC is able to run

while the HFCLK is OFF and PCLK16M is not available.

The software has to explicitely start LFCLK before using the RTC.

4430_161 v1.0

321

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