1.2.2 Calibrated 2 MHz RC Oscillator

This RC oscillator provides an approximate 2 MHz clock. The oscillator employs a Digital Frequency Locked Loop (DFLL) that can be enabled for automatic run-time calibration of the oscillator. A factory-calibrated value is written to the 2 MHz DFLL Calibration register during Reset to ensure that the oscillator is running within its specification. The Calibration register can also be written from software for manual run-time calibration of the oscillator.