M68SMASM

MOTOROLA

M68SMASM/D

3

These tools place few restrictions on the application. Some examples of the freedom allowed are:

symbol names up to 128 characters, 32 Kbyte symbols per source file, 256 sections, nested macros

and nested include files to 256 levels, and evaluation of all expressions using 32-bit arithmetic.

With the linker, a user arranges program sections to fit into physical memory. Sections can be con-

tained in one or more files facilitating rapid development and debugging. A user-defined directive

file instructs the linker where to place these sections. Additionally, the linker supports solutions to

more advanced problems, such as, partial linking and source level debugging.

Individual microcontroller instruction sets and addressing modes are optimized for high perfor-

mance. Motorola’s macro assembler supports the instruction sets of all our controllers with a com-

mon syntax and with language extensions that ease the upward migration path without sacrificing

any of the speed or efficient memory utilization benefits that assembly language provides.

ASSEMBLER DIRECTIVES

Assembly Control

Macros and Conditional Assembly

BASE

— Sets default number base

ELSEC

— Assemble when IFcc is false

END

— End of source program

ENDC

— End conditional assembly

FAIL

— User generated warning or error

ENDM

— End macro definition

INCLUDE

— Include secondary file

IFcc

— Conditional assembly

ORG

— Sets location counter

MACRO

— Macro definition

MEXIT

— Exit macro

Data Definition/Storage Allocation

Symbol Definition

ALIGN

— Aligns data or code in memory

EQU

— Equate symbol to a value

DC

— Allocates initialized storage

SECTION

— Start section

DCB

— Allocates initialized memory block

SET

— Set symbol to a value

DS

— Reserves uninitialized memory

XDEF

— External symbol definition

EVEN

— Align to next word address

XREF

— External symbol reference

LONGEVEN

— Align to next longword address

XREFB

— External byte reference

Listing Control and Options

CLIST

— Controls conditional assembly listing

LIST

— List the assembly

LLEN

— Sets length of listing line

MLIST

— Controls macro listing

NOLIST

— Stop assembly listing

NOPAGE

— Disables pagination in listing

PAGE

— Advance to next page

PLEN

— Sets page length

SPC

— Insert blank lines in listing

TABS

— Sets the tab length

TTL

— Sets the title

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