NRF52811-QCAA-R datasheet(249/444 Pages) NORDIC

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Peripherals

Important: The TICK event is disabled by default.

6.16.6 Event control feature

To optimize RTC power consumption, events in the RTC can be individually disabled to prevent PCLK16M

and HFCLK being requested when those events are triggered. This is managed using the EVTEN register.

For example, if the TICK event is not required for an application, this event should be disabled as it is

frequently occurring and may increase power consumption if HFCLK otherwise could be powered down for

long durations.

This means that the RTC implements a slightly different task and event system compared to the standard

system described in Peripheral interface on page 74. The RTC task and event system is illustrated in

Tasks, events and interrupts in the RTC on page 249.

RTC

core

TASK

Task signal from PPI

write

task

event

EVENT m

IRQ signal to NVIC

INTEN

RTC

EVTEN

Event signal to PPI

Figure 92: Tasks, events and interrupts in the RTC

6.16.7 Compare feature

There are a number of Compare registers.

For more information, see Registers on page 254.

When setting a compare register, the following behavior of the RTC compare event should be noted:

• If a CC register value is 0 when a CLEAR task is set, this will not trigger a COMPARE event.

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NRF52811-QCAA-R Datasheet(PDF) 249 Page - Nordic Semiconductor