米6体育平台手机版

SLAU131V October 2004 – February 2020

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4.6.1 Label Field

A label must be a legal identifier (see Section 4.8.1) placed in column 1. Every instruction may optionally have a label. Many directives allow a label, and some require a label.

A label can be followed by a colon (:). The colon is not treated as part of the label name. If you do not use a label, the first character position must contain a blank, a semicolon, or an asterisk.

When you use a label on an assembly instruction or data directive, an assembler symbol (Section 4.8) with the same name is created. Its value is the current value of the section program counter (SPC, see Section 2.4.5). This symbol represents the address of that instruction. In the following example, the .word directive is used to create an array of 3 words. Because a label was used, the assembly symbol Start refers to the first word, and the symbol will have the value 40h.

.    .    .    .
       9 0000       ; Assume some code was assembled
      10 0040 000A  Start:  .word 0Ah,3,7
         0044 0003 
         0048 0007

A label on a line by itself is a valid statement. When a label appears on a line by itself, it points to the instruction on the next line (the SPC is not incremented):

       3 0050        Here:
       4 0050 0003           .word 3

A label on a line by itself is equivalent to writing:

Here: .equ $ ; $ provides the current value of the SPC

If you do not use a label, the character in column 1 must be a blank, an asterisk, or a semicolon.