SLAU131V October 2004 – February 2020
Some assembler directives, such as .if, require well-defined absolute constant expressions as operands. Well-defined expressions contain only symbols or assembly-time constants that have been defined before they occur in the directive's expression. In addition, they must use the correct number of operands and the operation must make sense. The evaluation of a well-defined expression must be unambiguous.
This is an example of a well-defined expression:
1000h+X
where X was previously defined as an absolute symbol.