Motorola HC12 - Manual (Page 231)

Operating Procedures
Splitting an Application into Different Modules
MCUez HC12 Assembler User’s Manual
MOTOROLA Operating Procedures 231
11.5 Splitting an Application into Different Modules
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.