Can the contents of RTC backup register become corrupted in case of VDD power reset while write operation is ongoing (VBAT is present)?

[Satty]

Hello ST Community,

I am using RTC backup register of STM32F746ZG for saving some accumulating data.

So i'm afraid of situation when i start write operation and in the same time the VDD power is disabled.

Couldn't find any information about this, so i assume, the only way to guarantee data consistency will be duplicating it?

[TDK · Accepted solution]

The BOR should protect you from undefined behavior, although it may kick in midway through updating the registers, so half may be updated while the other half are not.

[Satty]

Thanks for you answer!

I can deal with updating only half (actually I'm using only one register for that kind of data).