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The Use Of The Keil C51

If you’ve looked at a few 8051 datasheets, other 8051 books or flicked through the chapters in this guide, you may be left thinking that it is necessary to be an 8051 expert to produce workable programs with C51. Nothing could be further from the truth. It is perfectly possible to write real commercial programs with nothing more than a reasonable knowledge of the ISO C language and some appreciation of hardware. However, to get the maximum performance from the 8051 family, knowing a few tricks is very useful. This is particularly true if you are working on a very cost-sensitive. | C51 Primer An Introduction To The Use Of The Keil C51 Compiler On The 8051 Family Edition 3.6 05 October 2003 by Mike Beach Editor for Edition 3.6 Chris Hills Chris Hills Digitally signed by Chris Hills DN CN Chris Hills C GB O Phaedrus systems OU Phaedrus Systems Reason I am the author of this document Location Tamworth UK Date 2003.10.05 19 23 35 01 00 hitex H DEVELOPMENT TOOLS Hitex UK Ltd. Tel 44 24 7669 2066 Fax 44 24 7669 2131 www.hitex.co.uk Copyright Hitex UK Ltd. 1996 2002 Phaedrus Systems 2002 2003 All Rights Reserved. No Part of this publication may be transmitted transcribed stored in a retrieval system translated into any language in any form by any means without the written permission of Hitex UK Ltd. www.hitex.co.uk page 2 of 190 Version 3.5 Contents 0 About The C51 Primer.7 0.1 History.8 1 Introduction.11 2 Compiler Chain.13 3 C51 Basics - The 8051 Architecture.15 3.1 8051 Memory Configurations.15 3.1.1 Physical Location Of The Memory Spaces.15 3.2 Hardware Memory Models.19 3.2.1 External DATA.19 3.2.2 External Code.20 3.2.3 Write to CODE Space.20 3.3 Possible Memory Models.21 3.3.1 ROM Memory Models.21 3.3.2 RAM Memory Models.22 3.3.3 Choosing The Best Memory Configuration Model.23 3.3.4 What data goes where .25 3.4 Setting The Memory Model.26 3.5 Local Memory Model Specification.27 3.5.1 Overview.27 4 Declaring Variables And Constants.29 4.1 Constants.29 4.2 Variables. 30 4.2.1 Uninitialised Variables.30 4.2.2 Initialised Variables.31 4.3 Watchdogs With Large Amounts Of Initialised Data.32 4.4 C51 Variables. 33 4.4.1 Variable Types.33 4.4.2 Special Function Bits.35 4.4.3 Converting Between Types.36 4.4.4 A Non-ISO Approach To Checking Data Type Overflow.37 5 Program Structure And Layout.39 5.1 Modular Programming In C51 . 39 5.2 Accessibility Of Variables In Modular Programs.42 5.3 Building a C51 Modular Program.45 5.3.1 The Problem.45 5.3.2 Maintainable Inter-Module Links.45 5.4 Standard Templates and Version Control .51 5.4.1 Version Control.51