Epson S5U1C17001C, Manual

Page: 414 / 742

8-8
EPSOn
S5U1C17001C ManUal
(C COMPilEr PaCkagE fOr S1C17 faMily) (Ver. 1.5.0)
8 aSSEMBlEr
8.5.4 Data Defining Directives (
.long
,
.short
,
.byte
,
.ascii
,
.space
)
The following assembler directives are used to define data in
.data
or
.text
sections:
list of data defining directives
.long
Define 4-byte data.
.short
Define 2-byte data.
.byte
Define 1-byte data.
.ascii
Define ASCII character strings.
.space
Fills an area with a byte data.
instruction format
.long
<4-byte data>
[ ,
<4-byte data>
...
,
<4-byte data>
]
.short
<2-byte data>
[ ,
<2-byte data>
...
,
<2-byte data>
]
.byte
<1-byte data>
[ ,
<1-byte data>
...
,
<1-byte data>
]
.ascii "
<character string>
" [ ,"
<character string>
"
...
,"
<character string>
" ]
.space
<length>
[ ,
<1-byte data>
]
<4-byte data>
0x0
–
0xffffffff
<2-byte data>
0x0
–
0xffff
<1-byte data>
0x0
–
0xff
<character string> ASCII character string
<length> Area size to be filled
Description
(1)
.long
,
.short
,
.byte
Defines one or more 4-byte data, 2-byte data, or 1-byte data. When specifying two or more data, separate
them with a comma.
The defined data is located beginning with a boundary address matched to the data size by the data defining
directive unless it is immediately preceded by the
.align
directive. If the current position is not a
boundary address, 0x00 is set in the interval from that position to the nearest boundary address.
Example:
.long 0x0,0x1,0x2
.byte 0xff
In addition to these directives, the directives listed below can also be used.
.hword
same as
.short
.word
same as
.short
.int
same as
.short
(2)
.ascii
Defines one or more string literals. Enclose a character string in double quotes. ASCII characters and an
escape sequence that begins with a symbol "
\
" can be written in a character string. For example, if you
want to set double quote in a character string, write
\"
; to set a
\
, write
\\
.
When specifying two or more strings, separate them with a comma.
The defined data is located beginning with the current address first, unless it is immediately preceded by the
.align
directive.
Example:
.ascii "abc","xyz"
.ascii "abc\"D\"efg"
(
= abc"D"efg
)
(3)
.space
An area of the specified <length> bytes long is set to <1-byte data> . The area begins from the current
address unless it is immediately preceded by the
.align
directive.
If <1-byte data> is omitted, the area is filled with 0x0. To fill the area with 0x0, the
.zero
directive (see
the next page) can also be used.
Example:
.space 4,0xff
Sets 0xff to the 4-byte area beginning from the current address.
.zero 4
(
= .space 4,0x0
)