BDM interface can not be protected in MPC8xx - there is no "debug disable" fuses or something like that.
So, there is no 100% guarantied way to protect your MPC8xx device from debugging, but:
1. You can reconfigure debug port pins to other functions in DBGC / DBPC fields of RCW
2. In your software you can detect the fact that the debug mode is enabled and behave differently, for example erase critical data.
Have a great day,
Alexander
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