Datasheet

29.4. Clock characteristics
29.4.1. Calibrated internal RC oscillator accuracy
Table 29-2. Calibration accuracy of internal RC oscillator.
Frequency V
CC
Temperature Calibration
accuracy
Factory calibration 8.0MHz 3V 25°C ±1%
User calibration 7.3MHz - 8.1MHz 2.7V - 5.5V -40°C to +85°C ±10%
29.5. External clock drive characteristics
Figure 29-2. External clock drive waveforms.

 


V
IL1
V
IH1
Table 29-3. External clock drive.
Symbol Parameter VCC = 2.7V - 5.5V VCC = 4.5V - 5.5V Units
Min. Max. Min. Max.
1/tCLCL Oscillator Frequency 0 8 0 16 MHz
tCLCL Clock Period 125 62.5 ns
tCHCX High Time 50 25
tCLCX Low Time 50 25
tCLCH Rise Time 1.6 0.5 μs
tCHCL Fall Time 1.6 0.5
Δt
CLCL
Change in period from one clock cycle
to the next
2 2 %
Atmel ATmega16M1/32M1/64M1 [DATASHEET]
Atmel-8209F-ATmega16M1/32M1/64M1_Datasheet_Complete-10/2016
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