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ATXMEGA64A1 Datasheet(PDF) 35 Page - ATMEL Corporation |
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ATXMEGA64A1 Datasheet(HTML) 35 Page - ATMEL Corporation |
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35 / 99 page  35 8067I–AVR–04/09 XMEGA A1 18. RTC - 16-bit Real-Time Counter 18.1 Features • 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 18.2 Overview The XMEGA A1 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 18-1. 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 18-1. Real Time Counter overview 10-bit prescaler Counter Period Compare = = Overflow Compare Match 1 kHz 32 kHz |
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