Motorola HC12 - page 133

Assembler Syntax
Source Line
MCUez HC12 Assembler User’s Manual
MOTOROLA Assembler Syntax 133
Long branch instructions (LBRA, LBEQ, etc.) expect a signed offset encoded
on two bytes. The valid range for a long branch offset is [–32,768...32,767].
Using the special symbol for location counter, it is possible also to specify an
offset to the location pointer as the target for a branch instruction. The *
(asterisk) refers to the beginning of the instruction where it is specified.
Example:
main:
NOP
NOP
BRA *-2
In this example, after the two NOPs have been executed, the application
branches at offset –2 from the BRA instruction (for instance, on label main).
Inside an absolute section, expressions specified in a PC relative addressing
mode may be:
• A label defined in any absolute section
• A label defined in any relocatable section
• An external label, defined in an XREF directive
• An absolute EQU or SET label
Inside a relocatable section, expressions specified in a PC relative addressing
mode may be:
• A label defined in any absolute section
• A label defined in any relocatable section
• An external label, defined in an XREF directive