atxmega128d4-mh ATMEL Corporation, atxmega128d4-mh Datasheet - Page 34

• Manufacturer Part Number: atxmega128d4-mh
• Description: 8/16-bit Xmega D4 Microcontroller
• Manufacturer: ATMEL Corporation

18. RTC - 16-bit Real-Time Counter
18.1
18.2
8135F–AVR–02/10
Features
Overview
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The XMEGA D4 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
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 18-1. Real Time Counter 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
Figure
32.768 kHz
1.024 kHz
prescaler
10-bit
18-1.
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=
Overflow
Compare Match
Compare
Counter
Period
XMEGA D4
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