External EEPROMs are often used in automotive applications to store adaptative/evolutive data.
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 using
the on-chip Flash of ST10F2xx devices.
Although the concept is easy to explain and implement “as is”, there are some embedded aspects
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 differences
between EEPROMs and embedded-Flash.

ST Microelectronics
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