Hi Bruce,
To work with the MM9Z1J638, we recommend using CodeWarrior® for MCUs (Eclipse IDE). This version of CodeWarrior provides full support for the MM9Z1J638 device and is compatible with the RD9Z1-638-12V reference board. It includes the necessary device files, compiler support and debugging capabilities.
You can download it from:
https://www.nxp.com/design/design-center/development-boards-and-designs/12-v-lead-acid-battery-manag...
Screenshot 2025-09-09 090718.png
BRs, Tomas