topic Re: Immediate addressing HC12 in CodeWarrior for MCU

Immediate addressing HC12

Pitrunner — Tue, 31 Oct 2006 21:08:04 GMT

Hello everybody,

I 've flw problem with CW. I want to load two ASCII signs in accu D. The code looks like LDD #'AA'. But I got an error message illegal addressing mode. If I load only one ASCII sign like LDD #'A', all is perfect. Has somebody an idea? Thank you for the help.

Re: Immediate addressing HC12

pittbull — Tue, 31 Oct 2006 23:26:26 GMT

Hi,
Try this:

// Store 'AB' into D
LDAA #'A'
LDAB #'B'

Re: Immediate addressing HC12

Pitrunner — Wed, 01 Nov 2006 00:27:58 GMT

Thank you for the answer.
This solution I know.
LDAA#'A'
LDAB#'A'

But we have here an old HP assembler for our HC11 controller and with that assembler the
LDD #'AA' instruction works.

Re: Immediate addressing HC12

CompilerGuru — Fri, 03 Nov 2006 09:36:14 GMT

With a

LDD #('a' << 8) + 'a'

You should get the same code (should because I did not try it out).
I dont think multi byte character constants are supported in the CW HC12 assembler.

Daniel

Re: Immediate addressing HC12

Pitrunner — Fri, 03 Nov 2006 15:19:23 GMT

Daniel,

thank you for the hint that multi byte character aren't supported with CW.
So I will try your solution.