16.7.7 Clock Failure Detector Control

Name: CFDCTRL
Offset: 0x16
Reset: 0x00
Property: PAC Write-Protection

Bit 76543210 
      CFDPRESCSWBACKCFDEN 
Access R/WR/WR/W 
Reset 000 

Bit 2 – CFDPRESC Clock Failure Detector Prescaler

This bit selects the prescaler for the Clock Failure Detector.
ValueDescription
0 The CFD safe clock frequency is the OSCULP32K frequency
1 The CFD safe clock frequency is the OSCULP32K frequency divided by 2

Bit 1 – SWBACK Clock Switch Back

This bit clontrols the XOSC32K output switch back to the external clock or crystal oscillator in case of clock recovery.
ValueDescription
0 The clock switch is disabled.
1 The clock switch is enabled. This bit is reset when the XOSC32K output is switched back to the external clock or crystal oscillator.

Bit 0 – CFDEN Clock Failure Detector Enable

This bit selects the Clock Failure Detector state.
ValueDescription
0 The CFD is disabled.
1 The CFD is enabled.