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ATmega325P Datasheet(PDF) 307 Page - ATMEL Corporation |
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ATmega325P Datasheet(HTML) 307 Page - ATMEL Corporation |
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307 / 364 page  307 8023F–AVR–07/09 ATmega325P/3250P 26.4 Clock Characterizations 26.4.1 Calibrated Internal RC Oscillator Accuracy Notes: 1. Voltage range for ATmega325PV/3250PV/645PV/6450PV. 2. Voltage range for ATmega325P/3250P. 26.4.2 External Clock Drive Waveforms Figure 26-3. External Clock Drive Waveforms 26.4.3 External Clock Drive Table 26-1. 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 26-2. 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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