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ATXMEGA8E5 Datasheet(PDF) 41 Page - ATMEL Corporation |
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ATXMEGA8E5 Datasheet(HTML) 41 Page - ATMEL Corporation |
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41 / 147 page  41 XMEGA E5 [DATASHEET] Atmel-8153I–AVR-ATxmega8E5-ATxmega16E5-ATxmega32E5_Datasheet–08/2014 Figure 21-1. Real-time counter overview. The RTC also supports correction when operated using external 32.768 kHz crystal oscillator. An externally calibrated value will be used for correction. The calibration can be done by measuring the default RTC frequency relative to a more accurate clock input to the device as system clock. The RTC can be calibrated to an accuracy of ±0.5 PPM. The RTC correction operation will either speed up (by skipping count) or slow down (adding extra cycles) the prescaler to account for the crystal oscillator error. 32.768 kHz Crystal Osc 32.768 kHz Int. Osc TOSC1 TOSC2 External Clock 32 kHz int ULP (DIV32) RTCSRC clkRTC CNT PER COMP = = ”match”/ Compare TOP/ Overflow CALIB Correction Counter Hold Count 10-bit prescaler |
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