ATXMEGA16A4-CU 查看數據表（PDF） - Atmel Corporation

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ATXMEGA16A4-CU

8/16-bit AVR® XMEGA A4 Microcontroller

Atmel Corporation 

XMEGA A4

19. RTC - 16-bit Real-Time Counter

19.1 Features

19.2 Overview

• 16-bit Timer

• Flexible Tick resolution ranging from 1 Hz to 32.768 kHz

• One Compare register

• One Period register

• Clear timer on Overflow or Compare Match

• Overflow or Compare Match event and interrupt generation

The XMEGA A4 includes a 16-bit Real-time Counter (RTC). The RTC can be clocked from an

accurate 32.768 kHz Crystal Oscillator, the 32.768 kHz Calibrated Internal Oscillator, or from the

32 kHz Ultra Low Power Internal Oscillator. The RTC includes both a Period and a Compare

register. For details, see Figure 19-1.

A wide range of Resolution and Time-out periods can be configured using the RTC. With a max-

imum resolution of 30.5 µs, time-out periods range up to 2000 seconds. With a resolution of 1

second, the maximum time-out period is over 18 hours (65536 seconds).

Figure 19-1. Real Time Counter overview

32 kHz

Period

Overflow

=

10-bit

prescaler

Counter

1 kHz

=

Compare Match

Compare

35

8069O–AVR–08/10

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