Rtcc - Real Time Counter And Calendar; Introduction; Features - Silicon Laboratories EFR32xG14 Wireless Gecko Reference Manual

13. RTCC - Real Time Counter and Calendar

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13.1 Introduction

The Real Time Counter and Calendar (RTCC) contains a 32-bit counter/calendar in combination with a 15-bit pre-counter to allow flexi-
ble prescaling of the main counter. The RTCC is available in all energy modes except EM4 Shutoff.
Three individually configurable Capture/Compare channels are available in the RTCC. These can be used to trigger interrupts, generate
PRS signals, capture system events, and to wake the device up from a low energy mode. The RTCC also includes 128 bytes of general
purpose storage and a Binary Coded Decimal (BCD) calendar mode, enabling easy time and date keeping.

13.2 Features

• 32-bit Real Time Counter.
• 15-bit pre-counter, for flexible frequency scaling or for use as an independent counter.
• EM4 Hibernate operation and wakeup.
• 128 byte general purpose retention data.
• Oscillator failure detection.
• Can continue through system reset; only reset by power loss, pin, or software reset.
• Calendar mode.
• BCD encoding.
• Three programmable alarms.
• Leap year correction.
• Three Capture/Compare registers.
• Capture of PRS events from other parts of the system.
• Compare match or input capture can trigger interrupts.
• Compare register 1, RTCC_CC1_CCV can be used as a top value for the main counter.
• Compare register 0, RTCC_CC0_CCV can be used as a top value for the pre-counter.
• Compare match events are available to other peripherals through the Peripheral Reflex System (PRS).
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RTCC - Real Time Counter and Calendar
Quick Facts
What?
The Real Time Counter and Calendar (RTCC) is a
32-bit counter ensuring timekeeping in low energy
modes. The RTCC also includes a calendar mode
for easy time and date keeping. In addition, the
RTCC includes 128 bytes of general purpose reten-
tion data, allowing persistent data storage in all en-
ergy modes except EM4 Shutoff.
Why?
Timekeeping over long time periods while using as
little power as possible is required in many low pow-
er applications.
How?
A low frequency oscillator is used as clock signal
and the RTCC has three different Capture/Compare
channels which can trigger wake-up, generate PRS
signalling, or capture system events. 32-bit resolu-
tion and selectable prescaling allow the system to
stay in low energy modes for long periods of time
and still maintain reliable timekeeping.
Reference Manual
Rev. 1.1 | 376