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 05 October 2003 by Mike Beach Editor for Edition 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 19 23 35 01 00 hitex H DEVELOPMENT TOOLS Hitex UK Ltd. Tel 44 24 7669 2066 Fax 44 24 7669 2131 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. page 2 of 190 Version Contents 0 About The C51 1 2 Compiler 3 C51 Basics - The 8051 8051 Memory Physical Location Of The Memory Hardware Memory External External Write to CODE Possible Memory ROM Memory RAM Memory Choosing The Best Memory Configuration What data goes where .25 Setting The Memory Local Memory Model 4 Declaring Variables And Variables. 30 Uninitialised Initialised Watchdogs With Large Amounts Of Initialised C51 Variables. 33 Variable Special Function Converting Between A Non-ISO Approach To Checking Data Type 5 Program Structure And Modular Programming In C51 . 39 Accessibility Of Variables In Modular Building a C51 Modular The Maintainable Inter-Module Standard Templates and Version Control .51 Version
