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Ax51 User's Guide
Ax51 Introduction Assembling Programs 
Writing Assembly Programs Assembly Statements 
Controls Instructions Comments Symbols and Symbol Names Labels Using Operands and Expressions Special Assembler Symbols Immediate Data Memory Access DATA BIT IDATA EDATA XDATA CODE Program Addresses Expressions and Operators Numbers Characters Character Strings Location Counter Operators ( ) * + - / < <= <> == > >= AND BYTEx EQ GT GTE HIGH LOW LT LTE MBYTE MOD NE NOT OR SHL SHR WORDx XOR Class Operators Expressions Expression Classes Relocatable Expressions Simple Relocatable Expressions Extended Relocatable Expressions Expressions Example Control Statements Macro Processor Error Messages AppendixClass Operators
The class operator assigns a memory class to an expression. This is how you associate an expression with a class. The Ax51 assembler generates an error message if you use an expression with a class on an instruction which does not support this class, for example, when you use an XDATA expression as a direct address.
The following table lists the class operators and provides a brief description of each.
| Operator | Syntax | Description |
|---|---|---|
| BIT | BIT expression | Assigns the class BIT to the expression. |
| CODE | CODE expression | Assigns the class CODE to the expression. |
| DATA | DATA expression | Assigns the class DATA to the expression. |
| IDATA | IDATA expression2 | Assigns the class IDATA to the expression. |
| XDATA | XDATA expression2 | True if expression1 is less than expression2 |
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