User manual

DEBUG MONITOR DESCRIPTION
M68CPU32BUG/D REV 1 2-2
The commands use a modified Backus-Naur syntax. The meta-symbols are:
The angular brackets enclose a symbol, known as a syntactic variable. The
syntactic variable is replaced in a command line by one of a class of
symbols it represents.
[] Square brackets enclose an optional symbol. The enclosed symbol may
occur zero or one time. In some cases, where noted, square brackets are
required characters.
[]... Square brackets followed by periods enclose a symbol that is
optional/repetitive. The symbol within the brackets may appear zero or
more times.
| This symbol indicates that a choice is to be made. Select one of several
symbols separated by a straight line.
/ Select one or more of the symbols separated by the slash.
{} Brackets enclose optional symbols that may occur zero or more times.
2.2.1 Syntactic Variables
The following syntactic variables are used in the command descriptions which follow. In
addition, other syntactic variables may be used and are defined in the particular command
description in which they occur.
<DEL> Delimiter; either a comma or a space. <EXP> - Expression (described in
detail in paragraph 2.2.1.1).
<ADDR> Address (described in detail in paragraph 2.2.1.2).
<COUNT> Count; the same syntax as < EXP> .
<RANGE> A range of memory addresses which may be specified either by <
ADDR><DEL><ADDR> or by <ADDR> :<COUNT> .
<TEXT> An ASCII string of as many as 255 characters, delimited with single quote
marks (’TEXT’).
DEBUG MONITOR DESCRIPTION
M68CPU32BUG/D REV 1 2-3
2.2.1.1 Expression as a Parameter
An expression is one or more numeric values separated by the arithmetic operators:
+ plus
– minus
* multiplied by
/ divided by
& logical AND
<< shift left
>> shift right
Base identifiers define numeric values as either a hexadecimal, decimal, octal or binary number.
Base Identifier Examples
Hexadecimal $ $FFFFFFFF
Decimal & &1974, &10-&4
Octal @ @456
Binary % %1000110
If no base identifier is specified, then the numeric value is assumed to be hexadecimal.
A numeric value may also be expressed as a string literal of as many as four characters. The
string literal must begin and end with single quote marks ('). The numeric value is interpreted as
the concatenation of the ASCII values of the characters. This value is right-justified, as is any
other numeric value.
String Literal Numeric Value (in hex)
’A’ 41
’ABC’ 414243
’TEST’ 54455354
Evaluation of an expression is always from left to right unless parentheses are used to group part
of the expression. There is no operator precedence. Sub-expressions within parentheses are
evaluated first. Nested parenthetical sub-expressions are evaluated from the inside out.
Fr
eescale S
emiconduct
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Freescale Semiconductor, Inc.
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