Read/write cycle life of RTC backup registers (STM32F373)

Posted on March 28, 2017 at 09:54

Hi all,

I'am using STM32F373 MCU, in my application,

the

RTC backup registers

updated every 10 minutes

.

I know some memory cycles limit read/write cycles, Eg, Eeprom memory only allows 10000 write /read cycles, if greater than that eeprom will die.

So, I wonder

RTC backup registers

have the same Epprom memory operations? Can I do multiple reads/writes cycle without fear of RTC Backup registers death?

Please confirm for me !

Thank in advance,

Viet Tran

This topic has been closed for replies.

Chief

Posted on March 28, 2017 at 14:52

RTC Backup is SRAM, with eventual battery backup. So nearly infinite write cycles.

Associate

Posted on March 29, 2017 at 02:37

Thanks Uwe Bonnes,

You can explain the difference in structure between SRAM and Eeprom, why SRAM nearly infinite write cycles but Eeprom ins limited ?

Guru

Posted on March 29, 2017 at 04:46

SRAM is an arrangement of transistors that can hold, actively, two distinct states, there is no charge holding structure, and nothing to wear out

Electrons get trapped in EEPROM over cycles, to the point it can only represent one state, instead of two

Think of EEPROM as a Lead Acid or NiCad battery it has some finite charge cycles, until the nature of the storage cell changes

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