Thank you for quick response, but that wasn't my problem.
I had marked "ANSI-Strict" under "Debug Settings->Language Settings-> C/C++ Language".
Without that mark, the compiler accept the noun "asm".
In spite of that, thank you, both.
How to create Listing (Assembler) "*.s" Files, to look what Metrowerks C-Compiler do.
Under "Edit->Preferences" or "Edit->M5213EVB UART Debug Settings", I don't find such an option.