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数据搜索系统，热门电子元器件搜索 |
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ATtiny5 数据表(PDF) 118 Page - ATMEL Corporation |
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ATtiny5 数据表(HTML) 118 Page - ATMEL Corporation |
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118 / 168 page  118 8127C–AVR–10/09 ATtiny4/5/9/10 16.4 Clock Characteristics 16.4.1 Accuracy of Calibrated Internal 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 17-39 on page 142 and Figure 17-40 on page 142. Notes: 1. Accuracy of oscillator frequency at calibration point (fixed temperature and fixed voltage). 16.4.2 External Clock Drive Figure 16-2. External Clock Drive Waveform Table 16-2. 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 Fixed temp. within: -40 °C – 85°C ±1% VIL1 VIH1 Table 16-3. External Clock Drive Characteristics 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 8 0 12 MHz tCLCL Clock Period 250 125 83 ns tCHCX High Time 100 50 33 ns tCLCX Low Time 100 50 33 ns tCLCH Rise Time 2.0 1 0.6 μs tCHCL Fall Time 2.0 1 0.6 μs Δt CLCL Change in period from one clock cycle to the next 2 2 2 % |
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