what is the best way to detect a 131KHz square wave?

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philip.porhammer

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I am working on a project to detect when a PPL goes out of lock. I have an interrupt routine that does capture up to 300KHz on a teency 3.2. I need to set an IO line High when the frequency is less that 100KHz.
I have never messed with internal timers.
Philip
 
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