PXN20RM Datasheet, PDF (37/1376 Pages) Freescale Semiconductor, Inc – PXN20 Microcontroller

reserved
MNEMONICS
mnemonics
italics
0x
0b
REG[FIELD]
nibble
byte
halfword
word
doubleword
x
x
n
~
&
|
||
OVERBAR
When a bit or address is reserved, it should not be written. If read, its value is not
guaranteed. Reading or writing to reserved bits or addresses may cause
unexpected results.
In text, instruction mnemonics are shown in uppercase.
In code and tables, instruction mnemonics are shown in lowercase.
Italics indicate variable command parameters.
Book titles in text are set in italics.
Prefix to denote hexadecimal number
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
A 16-bit data unit¹
A 32-bit data unit
A 64-bit data unit
In some contexts, such as signal encodings, x (without italics) indicates a “don’t
care” condition.
With italics, used to express an undefined alphanumeric value (e.g., a variable in
an equation); or a variable alphabetic character in a bit, register, or module name
(e.g., DSPI_x could refer to DSPI_A or DSPI_B).
Used to express an undefined numerical value; or a variable numeric character in
a bit, register, or module name (e.g., EIFn could refer to EIF1 or EIF0).
NOT logical operator
AND logical operator
OR logical operator
Field concatenation operator
An overbar indicates that a signal is active-low.
Register Figure Conventions
This document uses the following conventions for the register reset values in register figures:
—
Bit value is undefined at reset.
U
Bit value is unchanged by reset. Previous value preserved during reset.
[signal_name]
Reset value is determined by the polarity of the indicated signal.
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.
PXN20 Microcontroller Reference Manual, Rev. 1
Freescale Semiconductor
lix