12.3.7 Clock Failure Detection (CFD)
The Clock Failure Detection (CFD) allows the device to continue operating if an external crystal
oscillator or clock source fails. The CFD is enabled by writing a ‘1
’
to the Clock Failure Detection Enable (CFDEN) bit in the Main Clock Control C
(CLKCTRL.MCLKCTRLC) register. See the Clock Failure Detection Block Diagram for
monitorable oscillators and clocks sources.