NRF52820-QDAA-R datasheet(230/437 Pages) NORDIC

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Peripherals

6.13.4 Electrical specification

6.13.4.1 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

6.14 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 80: 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.

6.14.1 Clock source

The RTC runs off the LFCLK.

The COUNTER resolution is 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 explicitly start LFCLK before using the RTC.

See CLOCK — Clock control on page 69 for more information about clock sources.

6.14.2 Resolution versus overflow and the PRESCALER

4463_156 v1.0

230

NRF52820-QDAA-R Datasheet(PDF) 230 Page - Nordic Semiconductor

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