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PEC interrupt voltage level

Hi everybody,

I am using the PEC channel on a C167 to count a certain number of pulses in a certain amount of time. The interrupt associated with PEC channel is triggered when I use a input voltage switching between 0 and something above 5V.
It happens that my sensor's range is 7-12V ... so obviously the interrupt never occurs.
Is there a way to set the voltage threshold to trigger the interrupt? I can't find anything in the documentation ...

Thanks in advance for your time guys.