Errr....ummm...what can I say....obviously my keyboard is putting in the
wrong words again :o)

*MASTER* mode is pretty easy to implement in software......

I had this exact problem though.  I looked at the datasheet in it mentioned
I2C support, so I thought,"great, just the job".  It isn't at all obvious
that *only* slave mode is supported in hardware.  In fact, it took me ages
to convince one of the engineer here that it didn't.  I just let him find
out for himself in the end!

Cheers

Mike Rigby-Jones

> -----Original Message-----
> From: jamesp@intertex.net [SMTP:jamesp@intertex.net]
> Sent: Thursday, July 29, 1999 9:17 AM
> To:   Rigby-Jones, Michael [PAI01:4837:EXCH]
> Subject:      Re: Re: Adventure in realtime: PIC and the lost register
>
>
>  I must be missing something here.  Are you saying that "SLAVE
>  MODE" is pretty easy to implement in software but "SLAVE MODE"
>  is hard to implement in software.  That's why it's done with
>  hardware?  Am I halucinating?  I knew that coffee tasted funny
>  this morning. :-)
>
>                                         Regards,
>
>                                           Jim
>
>
>
> >Unfortunately you have to implement I2C master in software on most
> midrange
>
> >PICs.
> >I agree that slave mode is the one most people use, but it is also pretty
> >easy to implement in software.  Slave mode is very hard to do in software
> >which is why the hardware supports this mode.
> >
> >Cheers
> >
> >Mike Rigby-Jones
> >
> >
> >> -----Original Message-----
> >> From: Andy Koessler [SMTP:Andreas.Koessler@ASCOM.CH]
> >> Sent: Thursday, July 29, 1999 9:47 AM
> >> To:   PICLIST@MITVMA.MIT.EDU
> >> Subject:      Adventure in realtime: PIC and the lost register
> >>
> >> In the datasheet (reference_manual_DS33023) for PIC16/17 microchip
> refer
>
> >> to a
> >> register called SSPCON2.
> >> This is used to set the PIC16Cxx as an I2C MASTER (which is the most
> >> important
> >> mode I think). It gives controll for all the protocoll handles like
> ACK,
>
> >> NAK,
> >> arbitration etc.
> >> In the explizit datasheet for the 16Cxx this register ist missing. In
> the
>
> >> reference manual they describe how to deal with it but don't write
> which
>
> >> adress
> >> it's got. They refer to the AN578 and AN554 - all I see in this I don't
> >> want to
> >> use!
> >>
> >> Do I really have to implement the I2C protocoll like there is no
> special
>
> >> feature for this ?? (I really could do this on any pin of any port on
> any
>
> >> microcontroller - why I bought the PIC?)
> >>
> >> Angry Andy  (Newby, but I think I'm not going old with PIC...)
> >
>