Hcs12

**brad sue** · February 11th, 2008, 03:53 AM

Hi,

I am learning assembly for the micro controller MC9S12C32 with the compiler code warrior.

I would like to know if there someone that can help me. I have some problems with my codes and other questions regarding some instructions.

I read the earlier posts and it seems that there are the same instructions,
But I am not sure.

Please let me know

Thank you
B

**iviggers** · February 11th, 2008, 10:27 AM

Hi Brad Sue,

Most of postings in this section regard Intel x86 architecture (specially 16 and 32 bit).

You may find similar instructions between Intel and the architecture you work with, but in order to help you it would be necessary to know the details and syntax of assembly language for that architecture.

The good news is that once you learn assembler for one architecture, it will be much easier to get started with other architectures. This is because most (if not all) architectures are based on the same concepts.

Good luck.

**brad sue** · February 12th, 2008, 02:07 AM

Thank you,

OK. My program has two sections. My problem is first more about the organization of the code.

The first part is supposed to do the following:

The first section of the program should perform the following steps:

1 - Copy the data array into the Read-Write area of memory.
data contains only upper and lower case letters, spaces, and the digits 0-9, all ASCII. The array is terminated by a null (zero) byte. The array, including the null, is no more than 100 bytes long

2 - Search that array, converting each letter (a-z or A-Z) to a 1, each digit (0-9) to a 0, and leave the spaces unchanged.

3 - When the entire array has been processed, I continue with Section 2 of the program.
Here is what I did:

Code:

; copy array data into ROM

          ldx       #data
   repeat:

             ldaa   0,x   ;  get data entry into accumulator A
             inx             ; increment x
             [b]; here I don’t know how to check for null byte[/] 
             bne    repeat

            ; done copy data array

            ;now converting part:
            ; for value > 9 convert to 1 otherwise convert to 0
            ; special case for  space  character

     loop:

           ; case of space. Maybe misplace
           cmpy   #$20   ; compare with the  hex “space” value($20)
           sty       #$20


            ldy       0,x     ; get the data entry into Y register
           cmpy     #9     ; compare the current value> 9
           bls          L1    ; if not skip to L1
           sty          #0     ; if not store 0 into Y

      L1:
            sty       #1      ; store 1 into Y
            iny                 ; increment  Y   
            ;here don’t know how to check for the end of  x
             bra       loop

             bra        SECTION2

     SECTION2:
      ……..

I'd appreciate your help.

Thank you
B.

**stahta01** · February 12th, 2008, 11:36 AM

I wonder which school teaches Hcs12 assembly?

I have never coded HCS12, but it is very like MC6809.

[QUOTE=brad sue]Thank you,

OK. My program has two sections. My problem is first more about the organization of the code.

The first part is supposed to do the following:

The first section of the program should perform the following steps:

1 - Copy the data array into the Read-Write area of memory.
data contains only upper and lower case letters, spaces, and the digits 0-9, all ASCII. The array is terminated by a null (zero) byte. The array, including the null, is no more than 100 bytes long

2 - Search that array, converting each letter (a-z or A-Z) to a 1, each digit (0-9) to a 0, and leave the spaces unchanged.

3 - When the entire array has been processed, I continue with Section 2 of the program.
Here is what I did: