10.4 Clock Sources

The device has the following clock source options, selectable by Clock Main Select Bits in Clock Main Settings Register (CLKMSR.CLKMS). All synchronous clock signals are derived from the main clock. The three alternative sources for the main clock are as follows:
  • Calibrated Internal 8MHz Oscillator
  • External Clock
  • Internal 128kHz Oscillator.

Refer to description of Clock Main Select Bits in Clock Main Settings Register (CLKMSR.CLKMS) for how to select and change the active clock source.