Norman Gillaspie wrote:
>
> I need to have a pic emulate and communicate with an I2C bus.
> The PIC would then talk to two RF Synthesizer chips and an 8 bit DAC.<snip>
I'm not too clear about your app.

I interpret that you want your PIC to run an application,
and to control the other devices via I2Cbus and a three-wire bus
(presumably SPI).

This does not sound too difficult.
You can use the I2Cbus to control serial EEPROMs like the 24C02,
DACs, ADCs, parallel I/O, etc.

If you make it all-I2C you can avoid writing SPI code, and vice versa.

What kind of RF synth chips have you got, and what for?

Philips make digitally-programmable PLLs, which they use in their
TV tuner modules. These go through VHF/UHF/Cable/Satellite bands.
Circuit design at these frequencies is a bit of a black art, since
it is heavily dependent on physical layout.

I just got hold of their FQ916 VHF/UHF tuner module,
and fairly easily got it to scan these bands.

Tell us more about your app, and we may be able to be more helpful.

KH