Epson S5U1C17001C Manual page 111

(2) assembler Directives
The as assembler supports the standard directives provided in the gnu assembler. Refer to the gnu assembler
manual for the standard directives. Each directive begins with a period (.). The following lists often-utilized
directives.
.text
.section .data
.section .rodata
.section .bss
<data>
.long
<data>
.short
<data>
.byte
<string>
.ascii
<length>
.space
<length>
.zero
<value>
.align
<symbol>
.global
<symbol>,<address>
.set
(3) labels
A label is an identifier designed to refer to an arbitrary address in the program. You can refer to a branch
destination of a program or an address in the .text/.data section by using a symbol defined as a label.
Definition of a label
A symbol described in the following format is regarded as a label.
<Symbol>:
Preceding spaces and tabs are ignored. It is a general practice to describe from the top of a line.
A defined symbol denotes the address of a described location.
An actual address value will be determined in the linking process.
restrictions
Only the following characters can be used:
A–Z a–z _ 0–9
A label cannot begin with a numeral. Uppercase and lowercase are discriminated.
Examples: ;OK
FOO:
_Abcd:
L1:
S5U1C17001C ManUal
(C COMPilEr PaCkagE fOr S1C17 faMily) (Ver. 1.5.0)
Declares a .text section.
Declares a .data section.
Declares a .rodata section.
Declares a .bss section.
Defines a 4-byte data.
Defines a 2-byte data.
Defines a byte data.
Defines an ASCII character strings.
Defines a blank (0x0) space.
Defines a blank (0x0) space.
Alignment to a specified boundary address.
Defines a global symbol.
Defines a symbol with an absolute address.
;Error
1label:
0_ABC:
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