HI,
Could you please clarify your MCU derivative (MCU family) and used PCB board?
Does your board programming work in the past?
This error message means that debugger was not able to establish a connection with MCU.
The secured MCU may be one of possible root causes.
However, I would like to recommend to check the power supply, clock, and BDM connection first.
If MCU is powered correctly (high temperature typically signalize damaged MCU), the external clock is correctly configured (except newest S12 MCUs with CPMU module=internal clock) and the debugger is correctly connected (check BDM cable orientation,….), the security may remain as next possible root cause.
Did you configure any data in range 0xFF00..0xFF0F?
If yes, the MCU may be secured due to double bit ECC checksum error detection at this memory area.
More details about Security may be found here:
https://community.nxp.com/docs/DOC-93803
This document contains also a description how unsecure S12(X) MCU.
I hope it helps you.
Have a great day,
Radek
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