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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 AppendixCharacters
ASCII characters may be used in an expression to generate numeric values. Expressions may have up to two ASCII characters enclosed in single quotes ('). More than two characters in an expression causes an error. Following are several examples:
| Expression | Value |
|---|---|
| 'A' | 0041h |
| 'AB' | 4142h |
| 'a' | 0061h |
| 'ab' | 6162h |
| '' | Error: Null string is invalid. |
| 'ABC' | Error: More than 2 characters. |
Characters may be used anywhere in your program as a immediate data operand. For example:
LETTER_A EQU 'A'
TEST: MOV @R0, #'F'
SUBB A, #'0'
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