Funny NYPD wrote:
> Is there such a MCU product exist on the market, which has a unique 
> read-only ID on each chip? Most of today's Flash based MCU can be 
> assigned/programed with a unique ID, but this ID can be erased at chip 
> erase, it can also be copied.
>
> Currently we only found there are some standalone read-only "ID chip" 
> available from different vendors, I just want to make sure if there are 
> some MCU get this kind of ID feature.
>
> P.s. We have double check with Microchip MCUs, and confirmed none of the 
> PIC got this feature yet. I am curious if other brand of MCU has this 
> feature? E.g. a 12F508 equipped with such an ID can be identified from any 
> other 12F508s even though they are made on the same day, same lot, even 
> same die.
>

Why do you need this functionality?

Vitaliy 

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