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How to create PLL loss of lock ?

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We're using Aurix Tricore SAKTC297 Microcontroller.

The microcontroller is wired with external Crystal / Ceramic Resonator Mode with external components.

Safety Management Unit (SMU) alarm will be triggered when PLL loses it lock on external clock.

How can I cause PLL to lose lock on external clock ? Is it possible to do if in software ?

Please see attached for brief PLL description.
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