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@c  COPYRIGHT (c) 1988-2002.

@c  On-Line Applications Research Corporation (OAR).

@c  All rights reserved.

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@c  preface.texi,v 1.6 2002/01/17 21:47:46 joel Exp

@c

@ifinfo

@node Preface, CPU Model Dependent Features, Top, Top

@end ifinfo

@unnumbered Preface

The Real Time Executive for Multiprocessor Systems (RTEMS)

is designed to be portable across multiple processor

architectures.  However, the nature of real-time systems makes

it essential that the application designer understand certain

processor dependent implementation details.  These processor

dependencies include calling convention, board support package

issues, interrupt processing, exact RTEMS memory requirements,

performance data, header files, and the assembly language

interface to the executive.

This document discusses the Motorola MC68xxx

architecture dependencies in this port of RTEMS.  The MC68xxx

family has a wide variety of CPU models within it.  The part

numbers for these models are generally divided into MC680xx and

MC683xx.  The MC680xx models are more general purpose processors

with no integrated peripherals.  The MC683xx models, on the

other hand, are more specialized and have a variety of

peripherals on chip including sophisticated timers and serial

communications controllers.

It is highly recommended that the Motorola MC68xxx

RTEMS application developer obtain and become familiar with the

documentation for the processor being used as well as the

documentation for the family as a whole.

@subheading Architecture Documents

For information on the Motorola MC68xxx architecture,

refer to the following documents available from Motorola

(@file{http//www.moto.com/}):

@itemize @bullet

@item @cite{M68000 Family Reference, Motorola, FR68K/D}.

@end itemize

@subheading MODEL SPECIFIC DOCUMENTS

For information on specific processor models and

their associated coprocessors, refer to the following documents:

@itemize  @bullet

@item @cite{MC68020 User's Manual, Motorola, MC68020UM/AD}.

@item @cite{MC68881/MC68882 Floating-Point Coprocessor User's

Manual, Motorola, MC68881UM/AD}.

@end itemize