Motorola HC12 User Manual

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MCUez HC12 Assembler

User’s Manual

MOTOROLA

Sections

113

The linker PRM file contains at least:

•

The name of the absolute file (command LINK)

•

The name of the object file which should be linked (command NAMES)

•

Specification of a memory area where the sections containing variables
must be allocated. At least the predefined section

.data

must be placed

there (command SEGMENTS and PLACEMENT).

•

Specification of a memory area where the sections containing code or
constants must be allocated. At least the predefined section .

text

must

be placed there (command SEGMENTS and PLACEMENT).

•

Specification of application entry point (command INIT)

•

Definition of the reset vector (command VECTOR ADDRESS)

According to the PRM file in

•

The section

dataSec

 will be allocated starting at

0x0800

.

•

The section

constSec

 will be allocated starting at

0x0B00.

•

The section

codeSec

will be allocated next to the section

constSec

.

When the constant, code, and data sections cannot be allocated consecutively,
the PRM file used to link the previous example can be defined like this:

LINK test.abs

/* Name of the executable file generated. */

NAMES
  test.o

/* Name of the object files in the application. */

END
SEGMENTS
  ROM_AREA_1= READ_ONLY  0xB00 TO 0xB7F; /* READ_ONLY memory area. */
  ROM_AREA_2= READ_ONLY  0xC00 TO 0xC7F;/* READ_ONLY memory area. */
  RAM_AREA_1= READ_WRITE 0x800 TO 0x87F;/* READ_WRITE memory area. */
  RAM_AREA_2= READ_WRITE 0x900 TO 0x97F;/* READ_WRITE memory area. */
END
PLACEMENT
/* Relocatable variable sections are allocated in MY_RAM. */
  dataSec         INTO RAM_AREA_2;
  .data           INTO RAM_AREA_1;
/* Relocatable code and constant sections are allocated in MY_ROM. */
  constSec        INTO ROM_AREA_2;
  codeSec, .text  INTO ROM_AREA_1;
END
INIT entry

/*  Application entry point. */

VECTOR ADDRESS 0xFFFE entry /* Initialization of the reset vector. */