MCF51CN128 Reference Manual, Rev. 6
Freescale Semiconductor
xix
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Product briefs — Each device has a product brief that provides an overview of its features. This
document is roughly equivalent to the overview (Chapter 1) of an device’s reference manual.
•
Application notes — These short documents address specific design issues useful to programmers
and engineers working with Freescale Semiconductor processors.
http://www.freescale.com/coldfire
.
Conventions
This document uses the following notational conventions:
cleared/set
When a bit takes the value zero, it is said to be cleared; when it takes a value of
one, it is said to be set.
MNEMONICS
In text, instruction mnemonics are shown in uppercase.
mnemonics
In code and tables, instruction mnemonics are shown in lowercase.
italics
Italics indicate variable command parameters.
Book titles in text are set in italics.
0x0
Prefix to denote hexadecimal number
0b0
Prefix to denote binary number
REG[FIELD]
Abbreviations for registers are shown in uppercase. Specific bits, fields, or ranges
appear in brackets. For example, RAMBAR[BA] identifies the base address field
in the RAM base address register.
nibble
A 4-bit data unit
byte
An 8-bit data unit
word
A 16-bit data unit
1
longword
A 32-bit data unit
x
In some contexts, such as signal encodings, x indicates a don’t care.
n
Used to express an undefined numerical value
~
NOT logical operator
&
AND logical operator
|
OR logical operator
||
Field concatenation operator
OVERBAR
An overbar indicates that a signal is active-low.
Register Figure Conventions
This document uses the following conventions for the register reset values:
—
Undefined at reset.
u
Unaffected by reset.
1
The only exceptions to this appear in the discussion of serial communication modules that support variable-length data
transmission units. To simplify the discussion these units are referred to as words regardless of length.
