8-bit AVR Microcontroller

22.4.1 Accuracy of Calibrated Internal Oscillator

It is possible to manually calibrate the internal oscillator to be more accurate than default factory calibration. Note that the oscillator frequency depends on temperature and voltage. .

Table 22-2. Calibration Accuracy of Internal RC Oscillator
Calibration  Method	Target Frequency	V_CC	Temperature	Accuracy at given Voltage & Temperature
Factory  Calibration	8.0MHz	2.7 - 4.0V	0°C - 85°C	±2%
User  Calibration	Fixed frequency within:  7.3 - 8.1MHz	Fixed voltage within:  1.7 - 5.5V	Fixed temp. within:  -40°C - 85°C	±1%⁽¹⁾

Note:

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

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