You need to set LPCR_LPWUE bit which will enable the receiver to pass wake-up events to the SCI.
If the LIN Physical Layer receives a dominant level longer than tWUFR followed by a rising edge, it sends a pulse to the SCI module which can generate a wake-up interrupt.
In the SCI module, set SCIACR1_RXEDGIE to enable interrupt generation on an active edge. And clear RXEDGIF flag in the SCI interrupt routine.
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