Undefined instruction on C6000 CPU

RY9983

Guru 10570 points

Hello,

I have a basic question.
What does C6000 CPU operate when it get undefined operation code?

e.g.)
Binary "0xFFFFFFFF" will be decoded to ".word 0xFFFFFFFF".
What is its operation of C6000?

Best regards, RY

over 10 years ago

0 Chad Courtney over 10 years ago

TI__Mastermind 30825 points

If the data is not a valid opcode, it will not execute it, but instead treat it as a NOP and move on. On the later devices (I believe starting on C64x+ devices) it will also generate an Opcode exception. Which if you have exceptions enabled can be piped to a NMI.

Best Regards,

Chad

0 one and zero over 10 years ago in reply to Chad Courtney

TI__Mastermind 18136 points

This is documented in the CPU and Instruction Set Reference Guide

Chapters:

2.9.6 Internal Exception Report Register (IERR)

and

7.1.1.4 Internal Exceptions

Kind regards,

one and zero

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Undefined instruction on C6000 CPU