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INTRODUCTION
Substituting external EEPROM with emulated EEPROM from the embedded-Flash of the Microcontroller is a complex development. This application note assumes that readers are already familiar with the techniques used to secure the content of evolutive information in external EEPROM of embedded applications.
This application note is organized in 3 parts:
– description of the differences between external EEPROMs and embedded-Flash,
– general description of EEPROM emulation concept,
– introduction to embedded application aspects.
Although this application note is focused and applicable to ST10F269, ST10F280, ST10F276 (and its derivatives: ST10F275, ST10F273, ST10F272, ST10F271), ST10F252 and ST10F296, most of its content is not dependent on the microcontroller.
Description
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 embeddedFlash 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.
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---|---|---|---|---|---|---|---|
SMD |
23+ |
NA |
15659 |
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Panasonic |
24+ |
SOP-163.9mm |
1750 |
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PAN |
23+ |
SMD |
5000 |
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PANASONIC |
22+ |
SOP-163.9MM |
8200 |
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PANASONIC/松下 |
23+ |
SOP-163.9mm |
5000 |
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PANASONI |
23+ |
CDIP14 |
3880 |
正品原裝貨價(jià)格低 |
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EPCOS |
23+ |
SMD |
50000 |
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EPCOS |
18+ |
SMD |
9000 |
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PICOICC |
24+ |
SOT23-5 |
5650 |
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25+ |
PQFP-100 |
3200 |
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STMicroelectronics 意法半導(dǎo)體集團(tuán)
意法半導(dǎo)體 (STMicroelectronics) 成立于1987年,總部位于瑞士日內(nèi)瓦和法國(guó)巴黎,是一家全球領(lǐng)先的半導(dǎo)體公司。意法半導(dǎo)體專注于設(shè)計(jì)、制造和銷售各種半導(dǎo)體解決方案,產(chǎn)品廣泛應(yīng)用于汽車、工業(yè)、消費(fèi)電子、通信等領(lǐng)域。 意法半導(dǎo)體的產(chǎn)品包括微控制器、模擬集成電路、功率半導(dǎo)體、傳感器等。公司擁有多個(gè)研發(fā)中心和生產(chǎn)基地,致力于技術(shù)創(chuàng)新和研發(fā)投入。意法半導(dǎo)體在全球范圍內(nèi)擁有廣泛的客戶群和合作伙伴,為客戶提供高品質(zhì)的產(chǎn)品和解決方案。 公司的使命是通過(guò)半導(dǎo)體技術(shù)推動(dòng)智能化和可持續(xù)發(fā)展,助力客戶取得成功。意法半導(dǎo)體不僅注重商業(yè)成功,還注重社會(huì)責(zé)任、環(huán)境保護(hù)和可持續(xù)經(jīng)營(yíng)。企業(yè)價(jià)值觀包括創(chuàng)新、尊重