Cypress FM4 Series - Page 145

CHAPTER 3: Clock Supervisor
FM4 Peripheral Manual, Doc. No. 002-04856 Rev. *E 145
Example of Anomalous Frequency Detection Function Setup Procedure
No
Yes
No
Yes
No
Yes
End
Is the count value out of the window?
Is the interrupt flag set?
FCS interrupt occurs
Restart interrupt handling/FCS function
The FCS reset occurs
Is the FCS reset enabled?
Setup Start
Access CSV_CTL
Enable/disable the FCS reset
Access FCSWL_CTL
Set lower frequency window
Access INT_CLR
Clear the FCS interrupt factor
Access CSV_CTL
Set FCD (Count Edge setting)
Access FCSWH_CTL
Set upper frequency window
Access CSV_CTL Turn
ON the FCS function
Access INT_ENR
Enable/disable the FCS interrupt