Texas Instruments TMS320C3x - Manual (Page 467)

Instruction Set
13-9 Assembly Language Instructions
13.1.8 Illegal Instructions
The ’C3x has no illegal instruction-detection mechanism. Fetching an illegal
(undefined) opcode can cause the execution of an undefined operation. Proper
use of the TI TMS320 floating-point software tools will not generate an illegal
opcode. Only the following conditions can cause the generation of an illegal
opcode:
- Misuse of the tools
- An error in the ROM code
- Defective RAM