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ATmega3290P Datasheet(PDF) 329 Page - ATMEL Corporation |
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ATmega3290P Datasheet(HTML) 329 Page - ATMEL Corporation |
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329 / 385 page  329 8021E–AVR–07/09 ATmega329P/3290P 27.4 Clock Characteristics 27.4.1 Calibrated Internal RC Oscillator Accuracy Notes: 1. Voltage range for ATmega329PV/3290PV. 2. Voltage range for ATmega329P/3290P. 27.4.2 External Clock Drive Waveforms Figure 27-3. External Clock Drive Waveforms 27.4.3 External Clock Drive Table 27-1. 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) 2.7V - 5.5V(2) -40 ⋅C - 85⋅C±1% VIL1 VIH1 Table 27-2. 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 04 0 10 0 20 MHz tCLCL Clock Period 1000 100 50 ns tCHCX High Time 400 40 20 ns tCLCX Low Time 400 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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