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поискавой системы для электроныых деталей |
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поискавой системы для электроныых деталей |
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ATtiny13A датащи(PDF) 119 Page - ATMEL Corporation |
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ATtiny13A датащи(HTML) 119 Page - ATMEL Corporation |
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119 / 174 page  119 8126D–AVR–11/09 ATtiny13A 18.4 Clock Characteristics 18.4.1 Calibrated Internal RC Oscillator Accuracy 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 19-46 on page 147, Figure 19-47 on page 148, Figure 19-48 on page 148, Figure 19-49 on page 149, Figure 19-50 on page 149, and Fig- ure 19-51 on page 150. Notes: 1. Accuracy of oscillator frequency at calibration point (fixed temperature and fixed voltage). 18.4.2 External Clock Drive Figure 18-2. External Clock Drive Waveform Table 18-2. Calibration Accuracy of Internal RC Oscillator Calibration Method Target Frequency VCC Temperature Accuracy at given Voltage & Temperature(1) Factory Calibration 4.8 / 9.6 MHz 3V 25 ⋅C±10% User Calibration Fixed frequency within: 4 – 5 MHz / 8 – 10 MHz Fixed voltage within: 1.8V – 5.5V Fixed temperature within: -40 ⋅C – 85⋅C ±2% VIL1 VIH1 Table 18-3. External Clock Drive Symbol Parameter VCC = 1.8 - 5.5V VCC = 2.7 - 5.5V VCC = 4.5 - 5.5V Units Min. Max. Min. Max. Min. Max. 1/tCLCL Clock Frequency 0 4 0 10 0 20 MHz tCLCL Clock Period 250 100 50 ns tCHCX High Time 100 40 20 ns tCLCX Low Time 100 40 20 ns tCLCH Rise Time 2.0 1.6 0.5 µs tCHCL Fall Time 2.0 1.6 0.5 µs Δt CLCL Change in period from one clock cycle to the next 2 2 2 % |
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