Dave,
        Take a look at this...

http://dbserv.maxim-ic.com/quick_view2.cfm?qv_pk=2977

I think this is what you need

Mauricio Jancic
Janso Desarrollos
(54) 11 4542 3519
Republica Argentina
Microchip Consultant Program Member


-----Original Message-----
From: pic microcontroller discussion list
[mailto:PICLIST@MITVMA.MIT.EDU] On Behalf Of Nigel Orr
Sent: Martes, 22 de Julio de 2003 08:04
To: PICLIST@MITVMA.MIT.EDU
Subject: Re: [PIC]:1 wire master/slave problem


pic microcontroller discussion list <> wrote on Tuesday, July 22, 2003
12:59 AM:

> I have a PIC reading 1 wire devices, some on a bus, and some through a

> receptacle. My problem is I need to get the data in the PIC out
> through the receptacle. Can the PIC be made a Slave ? ( a PIC 16F877
> ).

Assuming the device is for production, the most legitimate way to turn
the PIC into a slave is probably to attach a memory device to it and
'hi-jack' its identity.  On boot, read the real 1-wire device, and use
its identity for the PIC circuit.  Then respond to memory requests with
the contents of the PIC memory instead.

I've not implemented this, but had it in mind for another purpose... the
open drain outputs should be usable as a 1-wire slave port, but you
might need to connect the bus to an interrupt pin as well to avoid
missing traffic!

I _think_ there are dummy iButtons available, but it might be easier to
put a standard connector on the bus and use it instead.  Alternatively,
you could use a memory iButton, dump the PIC data to it, then take it to
another reader to read the data into another PIC.

Nigel
--
Nigel Orr, Design Engineer                 nigel@axoninstruments.co.uk
Axon Instruments Ltd., Wardes Road,Inverurie,Aberdeenshire,UK,AB51 3TT
               Tel:+44 1467 622332 Fax:+44 1467 625235
                   http://www.axoninstruments.co.uk

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