newbie question: what does "loc16" refer to.

Chuck Sampson

Hello,

I am working through the TMS320C28x CPU and Instruction Set Reference Guide and I keep running to this term loc16 or loc32. For example:

ADDL loc32,ACC. Is loc32 a fixed memory location?

Thanks,

Chuck

over 11 years ago

0 Subrahmanya over 11 years ago

TI__Mastermind 24095 points

Hi Chuck,

Loc16/32 refer to the 16 or 32 bit access mode used for addressing.
Some of the instructions have a field in the opcode indicating loc16 or loc32 indicating whether that instruction would perform a 16 or 32 bit access at the location addressed.

-Bharathi.

0 Subrahmanya over 11 years ago in reply to Subrahmanya

TI__Mastermind 24095 points

Regarding your question on ADDL instruction, No - it's not a fixed location.
It only means that Instruction would perform 32-bit data access to the location.

0 Chuck Sampson over 11 years ago in reply to Subrahmanya

Genius 3295 points

Hello Bharathi,

Thanks for the quick and helpful reply. I see it now in table 5-1 of the Reference guide. It is just not yet clear to me how to change from loc16 to loc32 and what role AMODE0 and AMODE1 have to play in the selection. But that is because I still need to do more study.

-Chuck

0 Subrahmanya over 11 years ago in reply to Chuck Sampson

TI__Mastermind 24095 points

Chuck,

Thanks. That is correct. All the details can be found in spru430e.
Let me know if you need more details and good luck with c2000.

-Bharathi.

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newbie question: what does "loc16" refer to.