STM32F4 system bootloader: what technology is used Flash or ROM?

[sschirber]

Is the ROM in the STM32F4 a different memory technology than the flash or is it just write protected flash?

[mfgkw]

Which ROM do you mean?

[harp]

Meybe they mean the system ROM where USB/UART/etc bootloaders reside.

[sschirber]

Yes I mean the system ROM where USB/UART/etc bootloaders reside

 

[harp]

I think it  probably is mask ROM, but not sure. I can not find any documents about it.

[mƎALLEm]

Hello ​@sschirber and welcome to the ST community,

1- What memory you are referring to? OTP? system memory? else..?

2- The reason behind that question

[sschirber]

Yes I mean the system ROM where USB/UART/etc bootloaders reside for the STM32F4

[mƎALLEm]

​@sschirber  

You didn’t answert my 2nd question: The reason behind that question?

It’s a mask ROM. No difference in technology between different STM32 MCUs.

Does this answers your question?

[Andrew Neil]

As the others have said, what  “ROM” are you referring to here ?

Also, which particular STM32F4 family member(s) are you looking at? Please give full part number(s).

 

 

[sschirber]

I mean the system ROM where USB/UART/etc bootloaders reside for the STM32F4 versus the flash.

Also is it different technology between devices in this family or why is a full pn needed?

[db16122]

There is no ROM in the datasheet description. Do you mean OTP memory?

[sschirber]

Using the system memory bootloader ROM which is used for booting from uart mentioned here:

I think this is different even from the memory mentioned here