 A166 User's Guide | |
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A166 User's Guide
A166 Introduction Assembling Programs Operands and Expressions Operators Control Statements 
Macro Processor Standard Macro Processor 
Standard Macro Controls Defining Standard Macros Calling Standard Macros Local Symbols Exiting A Macro Built-in Macros REPT IRP IRPC Standard Macro Operators NUL Operator & Operator < and > Operators % Operator ;; Operator ! Operator MPL Macro Processor MPL Macro Overview MPL Meta Character Defining MPL Macros Calling MPL Macros Local Symbols Expressions Common Functions Bracket Function Comment Function Escape Function METACHAR Function SET Function EVAL Function Comparison Functions Conditional Functions EXIT Function IF Function REPEAT Function WHILE Function Console I/O Functions String Functions LEN Function MATCH Function SUBSTR Function Advanced Literal Delimiters Blank Delimiters Identifier Delimiters Literal and Normal Modes Errors Error Messages AppendixMPL Macro Processor
The Macro Processing Language (MPL) supported by the A166 Assembler is a string replacement facility that enables you to write resuable code blocks (macros) and insert them in one or more places in your source text.
The macro processor views the source file differently than the assembler.
- To the assembler, the source file is a series of directives, statements, and MCU instructions.
- To the macro processor, the source file is a long string of characters which are processed. The macro processor scans the source file in search of calls to defined macros. Macro calls are replaced with the built-in or user-defined macro.
A valuable capability of MPL is conditional assembly. The use of conditional assembly within your macros leads to compact configuration-dependent code which is critical to good program design. Additionally, it produces the most compact code possible.
Note
- Macro processing occurs before code is assembled. It is independent of assembly. Macro time is distinct from assembly time. Therefore, things that are known by the assembler (like assembly-language symbols, language labels, symbols defined with the SET and EQU statements, and the location counter) are unknown to the macro processor.
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