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AN2061

APPLICATION NOTE

September 2013

Description

External EEPROMs are often used in automotive applications to store adaptative/evolutive da-

ta. On the other hand, the Microcontroller used in those systems, are more and more based

on embedded-Flash.

The trend to continuously reduce the number of components is forcing designers to look to use

Flash memory to emulate EEPROM.

This application note will explain the differences between external EEPROMs and embedded-

Flash and will give advises on how to substitute external EEPROM to emulated-EEPROM us-

ing the on-chip Flash of ST10F2xx devices.

Although the concept is easy to explain and implement “as is”, there are some embedded as-

pects that have to be taken into account.

In this application note, the handling of embedded aspects to secure the content of an external

EEPROM are assumed to be known by the reader. So, this document is focusing on the dif-

ferences between EEPROMs and embedded-Flash.

EEPROM Emulation with ST10F2xx

DocID

10945 Rev 2