Hello,
There is no demo code directly for the S12ZVM32EVB, however, you can look at the Hands-on labs (attached). There you can find five LABs for the
S12ZVM and S12ZVM Hands-on.pdf where is a useful description.
Also, a lot of application notes related to S12ZVM devices can be found here:
MagniV® S12ZVM Mixed-Signal MCUs | NXP
Migration guide for the S12ZVM devices:
https://www.nxp.com/docs/en/application-note/AN5330.pdf
I hope it helps.
Best regards,
Diana