> Who here is using a PIC as a I2C master (controller)?
> I'm investigating the PIC as a controller, particularly the 16C73, for
I2C
> video chips (such as the closed-caption decoders from Philips and Zilog).

We've done this via code (not built-in I2C support).  We've done both
master and slave.   In one case, due to port limitations, we built a 4 unit
I2C bus, putting PC data into the main application chip via I2C bus.  We
used an interrupt line to let the bus master know it should begin a read.
I2C clock devices also use interrupt or 'alarm' lines if you want a regular
wakeup call (say once every 24 hours).  When the clock alarm line comes
high, reset the alarm for the next wakeup:

                PIC (Main application, bus master)

PC-----Serial------PIC

                Clock

                Memory