28.5.1 Main RC Oscillator

After reset, the main RC oscillator is enabled. This oscillator is selected as the source of MAINCK. MAINCK is the default clock selected to start the system.

The main RC oscillator is calibrated in production. For output frequency specifications, refer to the section “Electrical Characteristics”.

The software can disable or enable the main RC oscillator with the MOSCRCEN bit in the Clock Generator Main Oscillator register (CKGR_MOR).

When disabling the main RC oscillator by clearing the CKGR_MOR.MOSCRCEN bit, the PMC_SR.MOSCRCS bit is automatically cleared, indicating that the oscillator is off.

Setting the MOSCRCS bit in the Power Management Controller Interrupt Enable Register (PMC_IER) triggers an interrupt to the processor.