The assembler has reserved words.  Reserve word cannot be used in symbol, label, section name, macro name.  If a reserved word is specified, the CC-RH outputs the message and stops assembling.  Reserve word doesn't distinguish between uppercase and lowercase.
 
The reserved words are as follows.
| 
- | Instructions (such as add, sub, and mov) | 
| 
- | Register names, Internal register name | 
| 
- | GHS reserved sections ("_GHS", ".ghs", and section names starting with ".__ghs") |