Lpc2000

Yes.  I'm using the Embedded Artists 2148 Demo board, in which the
schematic shows pullups.  I'm connecting a RAM chip via their
accessory prototype board, which has direct connections to the I2C bus.

Sutton


--- In lpc2000@yahoogroups.com, "Dezheng Tang" <dtang@...> wrote:
>
> Do you have pull-ups on SCK and SDA lines?
> 
> 
> --- In lpc2000@yahoogroups.com, "Sutton Mehaffey" <sutton@> wrote:
> >
> > Can someone unconfuse me on several I2C issues as I try to 
> understand
> > the Philips I2C code in the file section?
> > 
> > On, my design using a LPC2148, I am using Master Transmitter mode 
> to
> > address a RAM.
> > 
> > The AA flag: Is it only used to acknowledge data received from the 
> RAM
> > after reading from I2C0DAT?  I assume that the ACKs received from 
> the
> > RAM when simply addressing it is not related to AA (but is the SI
> > bit).  I noticed in the Philips code that the only AA assertion is
> > done after receiving data from the chip.  I also assume that the 
> slave
> > will always give an ACK after sending it data (by the SI flag).  
> Or,
> > am I totally off base?
> > 
> > Also, does SCL run all the time, or just during the data transfer? 
> > I'm not seeing a SCL signal at all when I start my code.
> > 
> > Thanks.
> > 
> > Sutton
> >
>