became: MOV16 @_EPwm1Regs.CMPB,R1H ; CMPB = Duty * Period "../myproject-DPL-ISR.asm", ERROR! at line 72: [E0002] Invalid instruction for specified floating point accelerator MOV16 @_EPwm:n:Regs.CMPB,R1H ; CMPB = Duty * Period "../myproject-DPL-ISR.asm", REMARK at line 72: [R0001] After symbol substitution the line became: MOV16 @_EPwm1Regs.CMPB,R1H ; CMPB = Duty * Period "../myproject-DPL-ISR.asm", ERROR! at EOF: [E0300] The following symbols are undefined: R2H R1H R0H Errors in Source - Assembler Aborted gmake: *** [myproject-DPL-ISR.obj] Error 1 gmake: Target `all' not remade because of errors. **** Build Finished ****