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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 Appendix- Assembler Operator
| Arguments | - operand operand1 - operand2 | ||||||||||
| Description | The minus sign ('-') is used as the unary minus operator and as the subtraction operator. The unary minus operator is used to change the sign of the specified operand. If the value of the operand is positive, the sign is changed to negative. If the value is negative, it is changed to positive. The subtraction operator is used to subtract the value of operand2 from the value of operand1. The specified operands may be absolute or relocatable. The type of the resulting expression is determined by the operand types as shown in the following table:
1. Relocatable operands are allowed if both are defined in the same parent section. External operands are not allowed. Note
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| Example | labx: MOV R1, #5678-1234 laby: MOV R2, laby-labx |
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