Hi Cheng
Can you please double check you use CW5.1 or CW5.2?
CW5.2 doesn't support MC9S12DG256 but CW5.1 does.
Attached video is for how to find MC9S12DG256B in CW5.1. you can also use this for MC9S12DG256
Have a great day,
Jennie Zhang
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