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NRF52811-QCAA-R bảng dữ liệu(PDF) 249 Page - Nordic Semiconductor

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NRF52811-QCAA-R bảng dữ liệu(HTML) 249 Page - Nordic Semiconductor

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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
OR
Task signal from PPI
write
task
event
EVENT m
IRQ signal to NVIC
INTEN
m
RTC
EVTEN
m
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.
4454_140 v1.0
249



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