ATmega328PB

33.5.1 Calibrated Internal RC Oscillator Accuracy

Table 33-4. Calibration Accuracy of Internal RC Oscillator
	Frequency	V_CC	Temperature	Calibration Accuracy
Factory  Calibration	8.0 MHz	2.7V - 4.2V	0°C to +50°C	±2%
	8.0 MHz	1.8V - 5.5V	0°C to +70°C	±3.5%
	8.0 MHz	1.8V - 5.5V	-40°C to +105°C	±5%
User  Calibration	7.3 - 8.1 MHz	1.8V - 5.5V	-40°C to - 85°C	±1%

Note:

Accuracy of oscillator frequency at calibration point, fixed temperature and fixed voltage.

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