Calibrated Internal RC Oscillator Accuracy

The accuracy for the Calibrated Internal RC Oscillator has been improved in ATmega328PB.

Table 1. Calibration Accuracy of Internal RC Oscillator under 8MHz Frequency
Test condition Accuracy for ATmega328PB Accuracy for ATmega328 variants
Factory calibration ±2% ±10%
User calibration ±1% ±1%