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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 AppendixOperators
Operators may be unary (requiring one operand) or binary (requiring two operands). The combination of an operator and its operand(s) is an expression. Parentheses may be used in expressions with multiple operators to specify the order in which operators are evaluated. If no parentheses are used in an expression, operator precedence determines the evaluation order.
Following is the operator precedence table:
| Level | Operators |
|---|---|
| 1 | ( ) |
| 2 | NOT HIGH LOW BYTE0 BYTE1 BYTE2 BYTE3 WORD0 WORD2 MBYTE |
| 3 | Unary + Unary - |
| 4 | * / MOD |
| 5 | + - |
| 6 | SHL SHR |
| 7 | AND OR XOR |
| 8 | EQ = NE <> LT < LTE <= GT > GTE >= |
The Ax51 Assembler also supports the following C compatible operators. The C operators are identical with the corresponding Assembler operator are listed in the following table:
| C Operator | Identical Ax51 Operator |
|---|---|
| & | AND |
| | | OR |
| ^ | XOR |
| << | SHL |
| >> | SHR |
| != | NE <> |
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