AN945

www.DataSheet4U.com AN945 APPLICATION NOTE SOFTWARE DRIVERS for M29F040 and M29W040 FLASH MEMORIES CONTENTS Introduction The M29F040 Programming Model Modifying code from Am29F040 Generating SGS-THOMSON Code C Library Functions Adapting the Software for the Target System Limitations of the code Connection to Common Microprocessors Conclusion Source Code — INTRODUCTION This application note provides library source code in C for the M29F040 and the M29W040 Flash memories. The M29W040, with a rated power supply of 3V, is a low voltage version of the M29F040 whose power supply is rated at 5V. The M29W040 has slightly slower access times than the M29F040, but the two devices are otherwise very similar. This application note supports both devices and all technical information about the M29F040 also applies to the M29W040, except where otherwise specified. The application note includes listings of the source code which is also available in file form. The m29f040.c and m29f040.h files contain libraries for accessing both the M29F040 and the M29W040 Flash memories. An overview of the programming model for the M29F040 and M29W040 is given. The programming differences between the M29F040 and AMD’s Am29F040 are described. Advice on how to modify programs already written for AMD’s Am29F040 device to work with the ST device is included. The source code is written to be as platform independent as possible and requires minimal changes by the user in order to compile and run. The applicati...