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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 AppendixExpressions and Operators
An operand may be a numeric constant, a symbolic name, a character string or an expression.
Operators are used to combine and compare operands within your assembly program. Operators are not assembly language instructions nor do they generate A51 assembly code. They represent operations that are evaluated at assembly time. Therefore, operators can only handle calculations of values that are known when the program is assembled.
An expression is a combination of numbers, character string, symbols, and operators that evaluate to a single unsigned 32 bit binary number (for A51: 16-bit binary number). Expressions are evaluated at assembly time and can, therefore, be used to calculate values that would otherwise be difficult to determine beforehand. The assembler instantly converts negative decimal values to an internal unsigned binary representation.
The following topics describe operators and expressions and how they are used in A51 assembly programs.
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