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ATtiny44 データシート(PDF) 176 Page - ATMEL Corporation |
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ATtiny44 データシート(HTML) 176 Page - ATMEL Corporation |
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176 / 236 page  176 8006H–AVR–10/09 ATtiny24/44/84 Figure 20-2. Maximum Frequency vs. V CC (ATtiny24/44/84) 20.4 Clock Characteristics 20.4.1 Accuracy of Calibrated Internal RC Oscillator It is possible to manually calibrate the internal oscillator to be more accurate than default factory calibration. Note that the oscillator frequency depends on temperature and voltage. Voltage and temperature characteristics can be found in Figure 21-40 on page 206 and Figure 21-41 on page 206. Notes: 1. Accuracy of oscillator frequency at calibration point (fixed temperature and fixed voltage). 2. Voltage range for ATtiny24V/44V/84V. 3. Voltage range for ATtiny24/44/84. 20 MHz 10 MHz 2.7V 4.5V 5.5V Safe Operating Area Table 20-2. Calibration Accuracy of Internal RC Oscillator Calibration Method Target Frequency VCC Temperature Accuracy at given voltage & temperature(1) Factory Calibration 8.0 MHz 3V 25 °C±10% User Calibration Fixed frequency within: 7.3 – 8.1 MHz Fixed voltage within: 1.8V – 5.5V(2) 2.7V – 5.5V(3) Fixed temperature within: -40 °C – 85°C ±1% |
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