ATXMEGA32E5 datasheet(46/153 Pages) MICROCHIP

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DS40002059A-page 46

ATxmega32E5/16E5/8E5

21. RTC – 16-bit Real-Time Counter

21.1 Features



16-bit resolution

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Selectable clock source

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32.768kHz external crystal

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External clock

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32.768kHz internal oscillator

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32kHz internal ULP oscillator

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Programmable 10-bit clock prescaling

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One compare register

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One period register



Clear counter on period overflow



Optional interrupt/event on overflow and compare match



Correction for external crystal oscillator frequency error down to ±0.5ppm accuracy

21.2 Overview

The 16-bit real-time counter (RTC) is a counter that typically runs continuously, including in low power sleep modes, to

keep track of time. It can wake up the device from sleep modes and/or interrupt the device at regular intervals.

The reference clock is typically the 1.024kHz output from a high-accuracy crystal of 32.768kHz, and this is the configuration

most optimized for low power consumption. The faster 32.768kHz output can be selected if the RTC needs a resolution

higher than 1ms. The RTC can also be clocked from an external clock signal, the 32.768kHz internal oscillator or the 32kHz

internal ULP oscillator.

The RTC includes a 10-bit programmable prescaler that can scale down the reference clock before it reaches the counter.

A wide range of resolutions and time-out periods can be configured. With a 32.768kHz clock source, the maximum resolu-

tion is 30.5μs, and time-out periods can range up to 2000 seconds. With a resolution of 1s, the maximum timeout period is

more than 18 hours (65536 seconds). The RTC can give a compare interrupt and/or event when the counter equals the

compare register value, and an overflow interrupt and/or event when it equals the period register value.

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