
MOTOROLA
MPC823 USER’S MANUAL
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PREFACE
The
MPC823 User’s Manual discusses the operation, possible configurations, and
specifications of the MPC823 microprocessor. This manual mainly addresses Revision A of
the silicon, but exceptions are noted where appropriate. All the sections of the manual are
organized consistently to make it easier for you to use the manual as a reference. Due to its
length, the communication processor module section contains special tabs, links, and page
number references that you can use to get to a specific module.
Our website (www.mot.com/mpc823) contains a PDF (3.0) version of the manual that
contains hypertext linked cross-references and index markers, which make it easy for you
to get in, get the information you need, and get out. However, the links are only operable if
you download the file of the entire manual (mpc823.pdf). In the future, we plan to have an
online version of this manual in HTML format.
STYLES USED IN THIS MANUAL
Styles make it easier for you to look up the information you need, when you need it. The
following components are stylized in this manual:
Registers are defined in the module to which they belong. If they are mentioned
elsewhere, they are referred to by their acronym. It is important to note that register
tables include symbols to denote don’t care, unaffected, and reserved bits.
t # indicates that a bit is unaffected
t — denotes an undefined quality of a bit
t x indicates that a bit is a “don’t care” bit
t 0 or — indicates that a bit is reserved
Commands appear in BOLD UPPERCASE format.
Signals, pins, and bit names appear in UPPERCASE format.
Instructions appear in bold lowercase format.
COMPLEMENTARY DOCUMENTATION
Throughout this manual, there are references to the following documents that would enable
you to better understand the MPC823 microprocessor. We recommend that you use these
manuals in conjunction with the
MPC823 User’s Manual.
PowerPC Microprocessor Family: The Programming Environments for 32-Bit
Microprocessors (available from your local Motorola sales office using part number
MPCFPE32B/AD as a reference)
USB Specification (available from www.usb.org)