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'[PIC] Looking for smallest possible PIC Solution w'
2006\05\11@143411 by Jens M. Guessregen / Mailinglists n/a

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Hello all,

I am searching the smallest possible PIC, which has an I2C Interface.
But I do not find anything, which has an HW-based I2C interface with 8
pins.
Performance requirements are very low, I need the pic to programm a
grafik controller onetime at boot, and that's it.
The rest is just monitoring 1 input and setting 2 other outputs, when
the input it toggling.

When there is none with HW-interface, I will give a SW I2C a try. I need
master only and there is only one slave.
I do not know, how big the code is, I need for a SW solution, but maybe
someone has an idea?

Thx

Jens

2006\05\11@150501 by Bernd Rüter

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> When there is none with HW-interface, I will give a SW I2C a try. I need
> master only and there is only one slave.
> I do not know, how big the code is, I need for a SW solution, but maybe
> someone has an idea?

When your PIC uses only mastermode, give SW a chance !
I think, there are a lot of implementations around.
Only for slave-mode there is no other way then hardware...

greetings


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2006\05\11@160104 by Geo

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On 11 May 2006, at 20:34, Jens M. Guessregen / Mailingl wrote:

> I am searching the smallest possible PIC, which has an I2C Interface.
> But I do not find anything, which has an HW-based I2C interface with 8
> pins.
ATtiny25 ATtiny45 ATtiny 85 ?
(all 8 pin with TWI) - but not quite PICs ...

George Smith

2006\05\11@163653 by Bob Axtell

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Jens M. Guessregen / Mailinglists wrote:
> Hello all,
>
> I am searching the smallest possible PIC, which has an I2C Interface.
> But I do not find anything, which has an HW-based I2C interface with 8
> pins.
> Performance requirements are very low, I need the pic to programm a
> grafik controller onetime at boot, and that's it.
> The rest is just monitoring 1 input and setting 2 other outputs, when
> the input it toggling.
>
> When there is none with HW-interface, I will give a SW I2C a try. I need
> master only and there is only one slave.
> I do not know, how big the code is, I need for a SW solution, but maybe
> someone has an idea?
>
> Thx
>
> Jens
>
>  
Email me privately with a good email address, and I will send you a
working bit-banged I2C routine that
works from PIC12Cxxxx thru PIC18xxxx .

--Bob

2006\05\12@070538 by olin piclist

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> I am searching the smallest possible PIC, which has an I2C Interface.

10F200 if you only need it to be a IIC master.  IIC master can easily be
done in firmware.


******************************************************************
Embed Inc, Littleton Massachusetts, (978) 742-9014.  #1 PIC
consultant in 2004 program year.  http://www.embedinc.com/products

2006\05\12@084433 by Maarten Hofman

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>
> When your PIC uses only mastermode, give SW a chance !
> I think, there are a lot of implementations around.
> Only for slave-mode there is no other way then hardware...


Actually, slave mode is probably easier to implement in software than master
mode (of course, the hardware peripheral makes slave mode very easy, so I
wouldn't recommend implementing it in software).

Master mode is only easier when you can be sure (which is true, in this
case, I agree) that there is only one master on the bus.

Greetings,
Maarten Hofman.

2006\05\12@154637 by plunt

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This is not an endorsement of the source for the book, I just knew that they
sold copies. This book has assembly language versions of master and slave
for I2C. I am in the process myself of implementing on a pic 16f509, 8 pin
chip.

http://www.dontronics.com/sptoc.html
--
View this message in context: www.nabble.com/-PIC-Looking-for-smallest-possible-PIC-Solution-with-I2C-Interface-t1603127.html#a4364420
Sent from the MicroControllers - PIC forum at Nabble.com.

2006\05\12@161027 by Spehro Pefhany

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At 09:04 PM 5/11/2006 +0200, you wrote:
>>When there is none with HW-interface, I will give a SW I2C a try. I need
>>master only and there is only one slave.
>>I do not know, how big the code is, I need for a SW solution, but maybe
>>someone has an idea?
>
>When your PIC uses only mastermode, give SW a chance !
>I think, there are a lot of implementations around.
>Only for slave-mode there is no other way then hardware...
>
>greetings

Yes (single) master mode on I2C is not difficult at all. Look for code for
I2C EEPROMs and adapt that.

>Best regards,

Spehro Pefhany --"it's the network..."            "The Journey is the reward"
.....speffKILLspamspam@spam@interlog.com             Info for manufacturers: http://www.trexon.com
Embedded software/hardware/analog  Info for designers:  http://www.speff.com
->>Test equipment, parts OLED displys http://search.ebay.com/_W0QQsassZspeff


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