Motorola HC12 Manuale Utente

Operating Procedures

Splitting an Application into Different Modules

MCUez HC12 Assembler

User’s Manual

MOTOROLA

Operating Procedures

231

A complex application or application involving several programmers can be
split into several simple modules. In order to avoid any problem when merging
different modules, adhere to the following.

For each assembly source file, one include file must be created containing the
definition of the symbols exported from this module. For the symbols referring
to code label, a small description of the interface is required.

Example of assembly file (Test1.asm):

         XDEF AddSource

         XDEF Source

 initStack:EQU $AFF

 DataSec: SECTION

 Source:   DS.W 1

 CodeSec:  SECTION

 AddSource:

           ADD Source

           STD Source

           RTS

Corresponding include file (Test1.inc):

         XREF AddSource

         XREF AddSource

 ; The function AddSource adds the value stored in the variable

 ; Source to the content of register D. The result of the computation

 ; is stored in the variable Source.

 ;

 ; Input Parameter : register D contains the value, which should be

 ;                   added to the variable Source.

 ; Output Parameter: register D contains the result of the addition.

         XREF Source

 ; The variable Source is a word variable.