Texas Instruments TMS320C54x, Руководство пользователя

Страница: 122 / 469

Assign Character Strings to Substitution Symbols
.data
4-39 Assembler Directives
Syntax
.data
Description The .data directive tells the assembler to begin assembling source code into
the .data section; .data becomes the current section. The .data section is nor-
mally used to contain tables of data or preinitialized variables.
The assembler assumes that .text is the default section. Therefore, at the be-
ginning of an assembly, the assembler assembles code into the .text section
unless you use a section control directive.
For more information about COFF sections, see Chapter 2,
Introduction to Common Object File Format.
Example In this example, code is assembled into the .data and .text sections.
1 *******************************************
2 ** Reserve space in .data. **
3 *******************************************
4 000000 .data
5 000000 .space 0CCh
6
7 *******************************************
8 ** Assemble into .text. **
9 *******************************************
10 000000 .text
11 0000 INDEX .set 0
12 000000 e800 LD #INDEX, A
13
14 *******************************************
15 ** Assemble into .data. **
16 *******************************************
17 00000c Table: .data
18 00000d ffff .word –1 ; Assemble 16–bit
19 ; constant into .data.
20 00000e 00ff .byte 0FFh ; Assemble 8–bit
21 ; constant into .data.
22
23 *******************************************
24 ** Assemble into .text. **
25 *******************************************
26 000001 .text
27 000001 000c” ADD Table, A
28
29 *******************************************
30 ** Resume assembling into the .data **
31 ** section at address 0Fh. **
32 *******************************************
33 00000f .data