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поискавой системы для электроныых деталей |
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поискавой системы для электроныых деталей |
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ATtiny43U датащи(PDF) 157 Page - ATMEL Corporation |
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ATtiny43U датащи(HTML) 157 Page - ATMEL Corporation |
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157 / 182 page  157 8048B–AVR–03/09 20.4 Clock Characteristics 20.4.1 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. Notes: 1. Accuracy of oscillator frequency at calibration point (fixed temperature and fixed voltage). 20.4.2 External Clock Drive Figure 20-2. External Clock Drive Waveforms Table 20-2. 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% Table 20-3. External Clock Drive Characteristics Symbol Parameter VCC = 1.8 - 5.5V VCC = 2.7 - 5.5V Units Min. Max. Min. Max. 1/tCLCL Clock Frequency 0408 MHz tCLCL Clock Period 250 125 ns tCHCX High Time 100 50 ns tCLCX Low Time 100 50 ns tCLCH Rise Time 2.0 1.6 μs tCHCL Fall Time 2.0 1.6 μs Δt CLCL Period change from clock cycle to next 2 2 % VIL1 VIH1 |
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