Dose the CCS5 not supports the ARM assembler mnemonics, .eg DCD ,LDR？

I got some errors when I compiled some .asm files that have some ARM  assembler mnemonics instructions, .eg DCD and LDR, in TMS570 project.

I defined some symbols in .h files:

       extern unsigned int aaa;

in the .asm file :

     .ref aaa

    ldr r0, =aaa

I got no error when compiled the same project using IAR,  dose the  CCS not supports the ARM assembler mnemonics, .eg DCD ,LDR？