Motorola HC12 - Manual (Page 222)

User’s Manual MCUez HC12 Assembler
222 Operating Procedures MOTOROLA
Operating Procedures
In the previous portion of code, the instruction LDAA will be located at offset 0
from the section codeSec start address, and instruction ADDA will be located
at offset 3 from the codeSec start address.
8 8 codeSec: SECTION
9 9 entry:
10 10 000000 B6 xxxx LDAA cst1 ; Load value in cst1
11 11 000003 BB xxxx ADDA cst2 ; Add value in cst2
12 12 000006 7A xxxx STAA var ; Store in var
13 13 000009 20F5 BRA entry
To avoid problems during linking or executing an application, an assembly file
must:
• Initialize the stack pointer using the instruction LDS
• Publish the application entry point using XDEF
11.3.2 Linking an Application Containing Relocatable Sections
Applications containing relocatable sections must be linked. The linker
parameter file must contain at least the:
• Name of the absolute file
• Name of the object file which should be linked
• Specification of a memory area where the sections containing variables
must be allocated
• Specification of a memory area where sections containing code or
constants must be allocated
• Specification for the application entry point
• Definition of the reset vector