Freescale Semiconductor MCF52277 Reference Manual page 27

0b0
REG[FIELD]
nibble
byte
word
longword
x
n
~
&
|
||
OVERBAR
Register Figure Conventions
This document uses the following conventions for the register reset values:
—
u
[signal_name]
The following register fields are used:
R 0
W
R 1
W
R FIELDNAME
W
R FIELDNAME
W
R
W FIELDNAME
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.
Freescale Semiconductor
Prefix to denote binary number
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.
A 4-bit data unit
An 8-bit data unit
1
A 16-bit data unit
A 32-bit data unit
In some contexts, such as signal encodings, x indicates a don't care.
Used to express an undefined numerical value
NOT logical operator
AND logical operator
OR logical operator
Field concatenation operator
An overbar indicates that a signal is active-low.
Undefined at reset.
Unaffected by reset.
Reset value is determined by the polarity of the indicated signal.
Indicates a reserved bit field in a memory-mapped register. These bits are always read as zeros.
Indicates a reserved bit field in a memory-mapped register. These bits are always read as ones.
Indicates a read/write bit.
Indicates a read-only bit field in a memory-mapped register.
Indicates a write-only bit field in a memory-mapped register.
MCF52277 Reference Manual, Rev. 0
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