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ATmega644PA Datasheet(PDF) 333 Page - ATMEL Corporation |
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ATmega644PA Datasheet(HTML) 333 Page - ATMEL Corporation |
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333 / 468 page  333 8152G–AVR–11/09 ATmega164PA/324PA/644PA/1284P 27.3 Clock Characteristics Notes: 1. Voltage range for ATmega164PA/324PA/644PA/1284P. 27.3.1 External Clock Drive Waveforms Figure 27-2. External Clock Drive Waveforms 27.3.2 External Clock Drive Table 27-6. Calibration Accuracy of Internal RC Oscillator Frequency V CC Temperature Calibration Accuracy Factory Calibration 8.0 MHz 3V 25 °C ±10% User Calibration 7.3 - 8.1 MHz 1.8V - 5.5V(1) -40 °C - 85°C±1% VIL1 VIH1 Table 27-7. 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 Oscillator 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 22 2 % |
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