Hi Zachary,
Yes , in the header file of "MK20D7.h", it doesn't directly define the PORTx_PCRn.
(1) While we can use the struct of register to show , for example :
PORTA->PCR
(2) If you have CW , we also can refer to the header file of CW, copy the definition of PORTx_PCRn to the header file of KDS.

Have a great day,
Alice
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