Thanks guys for all the answers. Where can I find a detail datasheet for STM32F103 specially on the unique ID part? This seems to be a standard feature for all STM32Fxxx family. I did a quick search on ST web site and found nothing in detail on the documents about this feature. Funny N. Au Group Electronics, http://www.AuElectronics.com http://www.AuElectronics.com/products http://augroups.blogspot.com/ ________________________________ From: Funny NYPD To: Microcontroller discussion list - Public. Sent: Tuesday, September 29, 2009 7:40:19 AM Subject: Re: [EE]MCU with unique read-only ID? The unique read-only ID can be used for many functions. For instance, it can be used to identify each MCU, each individual products, etc. Funny N. Au Group Electronics, http://www.AuElectronics.com http://www.AuElectronics.com/products http://augroups.blogspot.com/ ________________________________ From: Vitaliy To: Microcontroller discussion list - Public. Sent: Monday, September 28, 2009 10:09:58 PM Subject: Re: [EE]MCU with unique read-only ID? 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 -- http://www.piclist.com PIC/SX FAQ & list archive View/change your membership options at http://mailman.mit.edu/mailman/listinfo/piclist -- http://www.piclist.com PIC/SX FAQ & list archive View/change your membership options at http://mailman.mit.edu/mailman/listinfo/piclist