MPLAB® XC8 C Compiler User’s Guide for AVR® MCU

Notice to Development Tools Customers

1.1 Conventions Used in This Guide

1.2 Recommended Reading

2 Compiler Overview

2.1 Device Description

2.2 C Standards

2.3 Hosts and Licenses

2.4 Conventions

2.5 Compatible Development Tools

3 Command-line Driver

3.1 Invoking The Compiler

3.2 The Compilation Sequence

3.3 Runtime Files

3.4 Compiler Output

3.5 Compiler Messages

3.6 Option Descriptions

3.7 MPLAB X IDE Integration

3.8 Microchip Studio Integration

4 C Language Features

4.1 C Standard Compliance

4.2 Device-Related Features

4.3 Supported Data Types and Variables

4.4 Memory Allocation and Access

4.5 Operators and Statements

4.6 Register Usage

4.9 Main, Runtime Startup and Reset

4.11 Mixing C and Assembly Code

4.12 Optimizations

4.13 Preprocessing

4.14 Linking Programs

5.1 Archiver/Librarian

6 Implementation-Defined Behavior

6.2 Translation

6.3 Environment

6.4 Identifiers

6.7 Floating-Point

6.8 Arrays and Pointers

6.10 Structures, Unions, Enumerations, and Bit-Fields

6.11 Qualifiers

6.12 Pre-Processing Directives

6.13 Library Functions

6.14 Architecture

7 Common C Interface

7.1 Background - The Desire for Portable Code

7.2 Using the CCI

7.3 C Language Standard Refinement

7.4 C Language Standard Extensions

7.5 Compiler Features

8 Library Functions

8.1 Library Example Code

8.2 <boot.h> Bootloader Functions

8.3 <cpufunc.h> CPU Related Functions

8.4 <delay.h> Delay Functions

8.5 <pgmspace.h>

8.6 <sfr_defs.h>

8.9 Built-in Functions

9 Document Revision History

The Microchip Website

Product Change Notification Service

Customer Support

Product Identification System

Microchip Devices Code Protection Feature

Quality Management System

Worldwide Sales and Service

The online versions of the documents are provided as a courtesy. Verify all content and data in the device’s PDF documentation found on the device product page.