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You can declare numeric, logical, or string variables using assembler directives.

The value of a variable can be changed as assembly proceeds. Variablesare local to the assembler. This means that in the generated codeor data, every instance of the variable has a fixed value.

The type of a variable cannot be changed. Variables are one of the following types:

  • Numeric.

  • Logical.

  • String.

The range of possible values of a numeric variable is thesame as the range of possible values of a numeric constant or numericexpression.

The possible values of a logical variable are {TRUE} or {FALSE}.

The range of possible values of a string variable is the sameas the range of values of a string expression.

Use the GBLA, GBLL, GBLS, LCLA, LCLL,and LCLS directives to declare symbols representing variables,and assign values to them using the SETA, SETL,and SETS directives.


a    SETA 100L1   MOV R1, #(a*5) ; In the object file, this is MOV R1, #500a    SETA 200       ; Value of 'a' is 200 only after this point.                     ; The previous instruction is always MOV R1, #500     …     BNE L1         ; When the processor branches to L1, it executes                     ; MOV R1, #500
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