Motorola HC12 User Manual
Sections
Section Types
MCUez HC12 Assembler
User’s Manual
MOTOROLA
Sections
111
The linker PRM file contains at least:
•
The name of the absolute file (command LINK)
•
The name of the object file that should be linked (command NAMES)
•
Specification of a memory area where the sections containing variables
must be allocated. At least the predefined section
must be allocated. At least the predefined section
.data
must be placed
there (command SEGMENTS and PLACEMENT). For applications
containing only absolute sections, nothing will be allocated.
containing only absolute sections, nothing will be allocated.
•
Specification of a memory area where the sections containing code or
constants must be allocated. At least the predefined section
constants must be allocated. At least the predefined section
.text
must
be placed there. For applications containing only absolute sections,
nothing will be allocated.
nothing will be allocated.
•
The application entry point (command INIT)
•
Definition of the reset vector (command VECTOR ADDRESS)
6.4.2 Relocatable Sections
The start address of a relocatable section is evaluated at link time, according to
the information stored in the linker parameter file. A relocatable section is
defined through the directive SECTION, as illustrated in
the information stored in the linker parameter file. A relocatable section is
defined through the directive SECTION, as illustrated in
XDEF entry
constSec: SECTION
; Relocatable constant data section
cst1:
DC.B $A6
cst2:
DC.B $BC
...
dataSec: SECTION
; Relocatable data section
var:
DS.B 1
codeSec: SECTION ; Relocatable code section
entry:
LDAA cst1
; Load value in cst1
ADDA cst2
; Add value in cst2
STAA var
; Store in var
BRA entry
Figure 6-3. Relocatable Section Programming Example