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поискавой системы для электроныых деталей |
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поискавой системы для электроныых деталей |
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ATtiny88 датащи(PDF) 203 Page - ATMEL Corporation |
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ATtiny88 датащи(HTML) 203 Page - ATMEL Corporation |
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203 / 266 page  203 8008C–AVR–03/09 ATtiny48/88 21.3 Speed Grades Maximum frequency is dependent on V CC. As shown in Figure 21-1, the Maximum Frequency vs. V CC curve is linear between 1.8V < VCC < 4.5V. Figure 21-1. Maximum Frequency vs. V CC 21.4 Clock Characterizations 21.4.1 Calibrated Internal Oscillator Accuracy It is possible to manually calibrate the internal oscillator to be more accurate than default factory calibration. Please note that the oscillator frequency depends on temperature and voltage. Volt- age and temperature characteristics can be found in TBD. Notes: 1. Accuracy of oscillator frequency at calibration point (fixed temperature and fixed voltage). 21.4.2 External Clock Drive Figure 21-2. External Clock Drive Waveforms 4 MHz 1.8V 5.5V 4.5V 12 MHz Table 21-1. Calibration Accuracy of Internal Oscillator Calibration Method Target Frequency V CC 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 Fixed temperature within: -40 °C – 85°C ±1% VIL1 VIH1 |
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