SLAU131V User guide | 德州仪器 TI.com.cn

SLAU131V October 2004 – February 2020

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5.4 Directives that Perform Alignment and Reserve Space

These directives align the section program counter (SPC) or reserve space in a section:

The .align directive aligns the SPC at a 1-byte to 32K-byte boundary. This ensures that the code following the directive begins on the byte value that you specify. If the SPC is already aligned at the selected boundary, it is not incremented. Operands for the .align directive must equal a power of 2 between 2⁰ and 2¹⁵, inclusive.

Figure 5-3 demonstrates the .align directive. Using the following assembled code:

       1 0000 0002          .field  2,3
       2 0000 005A          .field  11,5
       3                    .align  2
       4 0002 0045          .string "Err"
         0003 0072
         0004 0072
       5                    .align
       6 0006 0004          .byte   4

Figure 5-3 The .align Directive

The .bes and .space directives reserve a specified number of bytes in the current section. The assembler fills these reserved byres with 0s.
- When you use a label with .space, it points to the first byte that contains reserved bits.
- When you use a label with .bes, it points to the last byte that contains reserved bits.

Figure 5-4 shows how the .space and .bes directives work for the following assembled code:

       1 0000 0100           .word  0x100,0x200
         0002 0200
       2 0004       Res_1    .space 17
       3 0016 000F           .word  15
       4 002b       Res_2    .bes   20
       5 002c 00BA           .byte  0xBA

Res_1 points to the first byte in the space reserved by .space. Res_2 points to the last byte in the space reserved by .bes.

Figure 5-4 The .space and .bes Directives