Cryotimer - Ultra Low Energy Timer/Counter; Introduction; Features; Functional Description - Silicon Laboratories EFR32xG14 Wireless Gecko Reference Manual

22. CRYOTIMER - Ultra Low Energy Timer/Counter

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CRYOTIMER
Low Frequency
Oscillator

22.1 Introduction

The CRYOTIMER is a 32 bit counter which operates on a low frequency oscillator, and is capable of running in all energy modes. It can
provide periodic wakeup events and PRS signals which can be used to wake up peripherals from any energy mode. The CRYOTIMER
provides a very wide range of periods for the interrupts facilitating flexible ultra-low energy operation.
Because of its simplicity, the CRYOTIMER is a lower energy solution for periodically waking up the MCU compared to the RTCC.

22.2 Features

• 32 bit Counter
• Works in all the energy modes
• Only External and Power-On resets reset the CRYOTIMER
• Interrupt/wake up event after deterministic intervals
• PRS Output
• Debug mode
• Configurable to either run or stop when processor is stopped (break)

22.3 Functional Description

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Counter
=
Wakeup Event
Period
CRYOTIMER - Ultra Low Energy Timer/Counter
Quick Facts
What?
The CRYOTIMER is a timer capable of providing
wakeup events/interrupts after deterministic intervals
in all energy modes, including EM4.
Why?
The CRYOTIMER enables the chip to remain in the
lowest energy modes for long durations, while keep-
ing track of time and being able to wake up at regu-
lar intervals, all with an absolute minimum current
consumption.
How?
Using a counter running on a prescaled Low Fre-
quency Oscillator, the CRYOTIMER can provide pe-
riodic wakeup events with a very wide period range.
Reference Manual
Rev. 1.1 | 745