My programmer (MicroEngineerin Labs EPIC+) has software with a provision
for serializing chips.  It will insert an incrementing serial number in
program or EEPROM space automagically.

On Thu, 16 Aug 2001, Tony Pan wrote:

> We use Microchip PIC16C711. How (if possible) can we give each unit a serial
> number in ROM?
>
> ----- Original Message -----
> From: "Douglas Butler" <dbutler@IMETRIX.COM>
> To: <PICLIST@MITVMA.MIT.EDU>
> Sent: Thursday, August 16, 2001 1:56 PM
> Subject: Re: [PIC]: Generating a "truly" random number on the application of
> power
>
>
> > If you give each unit a serial number in ROM you can use that to delay
> > the start.  Dallas makes tiny one wire interfaced chips that have serial
> > numbers in them that are guaranteed to be unique.
> >
> > Sherpa Doug
> >
> > > -----Original Message-----
> > > From: Nikolai Golovchenko [mailto:golovchenko@MAIL.RU]
> > > Sent: Thursday, August 16, 2001 1:45 PM
> > > To: PICLIST@MITVMA.MIT.EDU
> > > Subject: Re: [PIC]: Generating a "truly" random number on the
> > > application of power
> > >
> > >
> > > Tony,
> > >
> > > You could try to use a few unitialized RAM locations. On power-up,
> > > they would probably contain random values. But the problem is that
> > > the compiler clears all registers on power-up, so the start-up
> > > routine should be modified, which might be tricky though...
> > >
> > >  Nikolai
> > >
> > > Tuesday, August 14, 2001, 10:17:59 AM, Tony Pan wrote:
> > > > Hi,
> > >
> > > > In our project, several identical boards are connected
> > > together. Normally,
> > > > on the application of power, they will be turned on at the
> > > same time and
> > > > starting running at the same time. But we don't want that
> > > to happen. If all
> > > > boards are running at the same time, they will consume too
> > > much power and
> > > > cause a problem.
> > >
> > > > So, we want to impose a lockout time at the beginning of
> > > the software; the
> > > > lockout time should be random for each board (though they
> > > use the same
> > > > software). Only after the lockout time expires would the
> > > program start
> > > > running. Thus the boards will start at different time and
> > > won't cause a
> > > > power shortage.
> > >
> > > > My question is: how to generate a "truly" random number on
> > > the application
> > > > of power. The number should not be determined upon the
> > > compilation of the
> > > > software, but should be upon the initial powerup of the
> > > chip. (Or, it should
> > > > be determine by each individual chip.)
> > >
> > > > Help?
> > >
> > > > (By the way, I write my program in C and use PICC compiler.)
> > >
> > > > Thanks in advance.
> > >
> > > > Tony Pan
> > >
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