Texas Instruments TMS320C54x, User Manual

Page: 5 / 469

Notational Conventions
v Read This First
-
In assembler syntax statements, column 1 is reserved for the first
character of a label or symbol. If the label or symbol is optional, it is usually
not shown. If it is a required parameter, then it will be shown starting
against the left margin of the shaded box, as in the example below. No
instruction, command, directive, or parameter, other than a symbol or
label, should begin in column 1.
symbol .usect ”section name”, size in words [, blocking flag]
[, alignment flag]
The symbol is required for the .usect directive and must begin in column 1.
The section name must be enclosed in quotes and the section size in
words must be separated from the section name by a comma. The
blocking flag and alignment flag are optional and, if used, must be
separated by commas.
-
Some directives can have a varying number of parameters. For example,
the .byte directive can have up to 100 parameters. The syntax for this
directive is:
.byte value
1
[, ... , value
n
]
This syntax shows that .byte must have at least one value parameter, but
you have the option of supplying additional value parameters, separated
by commas.
-
Following are other symbols and abbreviations used throughout this
document.
Symbol Definition Symbol Definition
AR0–AR7 Auxiliary Registers
0 through 7 PC Program counter
register
B,b Suffix — binary integer Q,q Suffix — octal integer
H,h Suffix — hexadecimal
integer SP Stack pointer register
LSB Least significant bit ST Status register
MSB Most significant bit
-
’C54x is used throughout this manual to collectively refer to the
TMS320C541, TMS320C542, TMS320C543, TMS320C544, TMS320C545,
TMS320C546, TMS320C547, TMS320C548, TMS320C549, and TMS320C545L
devices.
Note that .byte does not
begin in column 1.