AN2244 Datasheet, PDF (1/17 Pages) STMicroelectronics – The ST10F27x MCUs provide 0.18μm embedded true Flash technology

AN2244
Application note
EEPROM emulation with ST10F27x embedded Flash
using the ST10F27x Flash library
Introduction
The ST10F27x MCUs provide 0.18µm embedded true Flash technology.
This Flash technology has been designed to store software program instructions and is not
adapted to dynamic data storage because it can only be erased by sector.
Typically, when the code is programmed, some portions of the Flash remain free. This
unused space can be used as virtual EEPROM, thus avoiding the additional cost and
complexity incurred by using an external serial EEPROM.
This application note shows a method of performing EEPROM emulation. It provides
software routines to overcome the Flash limitations in terms of read/write access and
number of cycles.
This document is divided into the following sections:
■ Overview of ST10F27x Embedded Flash
■ The ST10F27x Flash library provided by STMicroelectronics
■ Application example: EEPROM Emulation. This application example helps the user to
become familiar with the ST10F27x Flash library, given that it uses the main important
Flash library functions of programming, erasing and verifying.
The application source files are provided within an associated downloadable package. This
file must be unpacked into a directory before use.
The EEPROM emulation driver was compiled using the two tool chains, Tasking and Keil,
and it can be ported easily to any other ST10 tool chain.
For more information, please refer to the ST10F27x related documentation.
September 2013
Rev 2
1/17
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