The User's Guide says: A valid cycle is any cycle that meets the frequency requirement as outlined in the device specific data sheet. Any crystal fault restarts the counter. The "any" means that the fault handling triggers when a cycle is longer than fFault,LF . So with fFault,LF between 10 Hz and 10 kHz, i.e., between 0.1 ms and 0.1 s, the corresponding number of 32.768 kHz cycles is somewhere between 3 and 3277.
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