Hercules Assembly Reference

Westin Sykes

I am writing assembly for the Hercules platform in CCS. Is there anywhere I can find a reference showing the instruction set? I have found a reference card for ARM, but many of the instructions seem to be different.

Thanks,

Westin

over 11 years ago

0 James Donahue over 11 years ago

Intellectual 370 points

At infocenter.arm.com, look for these 2 documents.

DDI0406A, ARM Arch Ref Man ARM-7 A and R.pdf

DDI0308D, Thumb-2 Supplement Ref Man.pdf

0 Westin Sykes over 11 years ago in reply to James Donahue

Expert 1335 points

What is it that is different in CCS than other ARM assemblers? Are the mnemonics different? One instruction in particular is CBNZ. If I try that, it says "[E0002] Illegal mnemonic specified".

Westin

0 James Donahue over 11 years ago in reply to Westin Sykes

Intellectual 370 points

As far as I know TI assemblers use standard ARM syntax I never noticed any discrepancies.. You will have to post a new question or get one of the TI moderators to move this thread to the compiler forum.

Can you show us your syntax?

0 Westin Sykes over 11 years ago in reply to James Donahue

Expert 1335 points

This is what I am using to get that error:

cbnz r0, $1

0 James Donahue over 11 years ago in reply to Westin Sykes

Intellectual 370 points

Two things, CBNZ is a Thumb only instruction. If you attempt to assemble it into ARM code you get the

"[E0002] Illegal mnemonic" message. Also CBNZ can only branch forward.

"Compare and Branch on Nonzero and Compare and Branch on Zero compares the value in a register with

zero, and conditionally branches forward a constant value. They do not affect the condition flags."

0 Westin Sykes over 11 years ago in reply to James Donahue

Expert 1335 points

I bet that is the issue. Thanks for the help.

Westin

0 KGreb over 11 years ago in reply to James Donahue

TI__Mastermind 23000 points

A word of caution on DDI0308D, ARM's Thumb-2 supplement. This document was originally created in ~2005 when the Thumb2 instruction set was new and the ARM architecture reference manual (ARM ARM) did not include Thumb-2 instructions. In other words, it was a stopgap documentation solution.

The contents of this document should now be incorporated into the v7A/R ARM ARM. I believe that ARM was to obsolete the DDI0308 document as a result.

Regards,
Karl

Arm-based microcontrollers

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Hercules Assembly Reference