Hi Denny,
Not everybody that shows an interested on a chip used in a key fob is
trying to circumvent it or indeed is requesting any support from the list
to do so.
Your comment is completly unnecessarily.

             Luis
On 3 Feb 2014 21:14, "Denny Esterline" <desterline@gmail.com> wrote:

> Google suggests that a HCS412 is a KEELOQ=AE Code Hopping Encoder and
> Transponder from Microchip.
> http://ww1.microchip.com/downloads/en/DeviceDoc/41099D.pdf
> (which was aimed primarily at the car fob market)
> My best guess is that the 1 at the end is the temperature range. (see pag=
e
> 49)
> Could also be a customized version for some large volume OEM, but I doubt
> it.
>
> BTW, these are security devices... trying to circumvent it not recommende=
d
> or supported by this list.
>
> -Denny
>
>
>
> On Mon, Feb 3, 2014 at 1:38 PM, Luis Moreira <
> luis.moreira1575@googlemail.com> wrote:
>
> > Hi Guys,
> > Looking for some info on a microchip device, the part number on it is
> > HCS4121. I not even know what it is, I presume it is a microcontroller
> or a
> > dedicated frequency generating chip. A datasheet would be nice.
> > This is from a car remote fob.
> > Thank you.
> > Best Regards
> >                         Luis
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