Why CMU should run on a different clock than WDOG?

[longyi1234]

Why CMU should run on a different clock than WDOG?

The chip I use is S32K1xx. This is what the Reference Manual says:

[longyi1234 · Accepted solution]

Got it. Thank you.

[PavelL]

Hi,

the reason is simple: if clock of CMU fails, the watchdog resets application (because is running on another clock) - assuming that CMU's reset is the safe state. Next actions depend on supervisor system.

If CMU and watchdog share the same clock, the application got stuck during clock malfunction.

Best regards,

Pavel