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Cx51 User's Guide

Cx51 Introduction

Compiling Programs

Language Extensions

Advanced Programming

Customization Files

Variable Initialization Code

Memory Allocation

Optimizer Options

General Optimizations

8051-Specific Optimizations

Global Register Coloring

Segment Naming Conventions

Program Objects

Parameters and Local Variables

Interfacing C to Assembler

Global Variables

Function Parameters

Passing in Memory

Passing in Registers

Function Return Values

Using the SRC Directive

Overlaying Segments

Small Model Example

Compact Model Example

Large Model Example

Interfacing C programs to PL/M-51

Data Storage Formats

Scalars: 1-Byte

Scalars: 2-Byte

Scalars: 4-Byte

Generic and Far Pointers

Floating-point Numbers

Floating-point Errors

Absolute Memory Locations

Absolute Access Macros

Linker Location Controls

The _at_ Keyword

8051 Derivatives

Library Reference

Appendix

Absolute Access Macros

The absolute memory access macros allow you to directly access the various memory areas of the 8051. These macros require that you specify the address you wish to read or write.

Related Knowledgebase Articles

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