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ATmega32U2 Datasheet(PDF) 266 Page - ATMEL Corporation |
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ATmega32U2 Datasheet(HTML) 266 Page - ATMEL Corporation |
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266 / 314 page  266 7799B–AVR–07/09 ATmega8U2/16U2/32U2 26.3 Speed Grades Maximum frequency is depending on V CC. As shown in Figure 26-1, the Maximum Frequency vs. V CC curve is linear between 2.7V < VCC < 4.5V. Figure 26-1. Maximum Frequency vs. V CC, ATmega8U2/16U2/32U2 26.4 Clock Characteristics 26.4.1 Calibrated Internal RC Oscillator Accuracy 26.4.2 External Clock Drive Waveforms Figure 26-2. External Clock Drive Waveforms 16 MHz 8 MHz 2.7V 4.5V 5.5V Safe Operating Area Table 26-1. Calibration Accuracy of Internal RC Oscillator Frequency VCC Temperature Calibration Accuracy Factory Calibration 8.0 MHz 3V 25 °C ±10% User Calibration 7.3 - 8.1 MHz 2.7V - 5.5V -40 °C - 85°C ±1% VIL1 VIH1 |
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