Processor Expert does not support generating assembly code for HCS12(X) derivatives. However there is the possibility to use the own assembly code in C project.
More detailed information about mixing the assembly code with C can be found in chapter 11 on page 501 in the Compiler_HC12.pdf file in .../{CodeWarrior}/Help/Pdf/Compiler_HC12.pdf.
best regards
Vojtech Filip
Processor Expert Support Team
UNIS
www.processorexpert.com