Read the ADuC manual/User guide. If The ADuC has hardware IIC, Philips has an appnote for the LPC932 that can be easily modified to Cygnal so it can probably also be modified to ADuC.

If the pins labelled SCLK and SDA ate just OC pins, you will need to write a bit banged IIC routine.

IIC is extremely well documented in Philips appnotes and virtually any IIC/2wire serial EEPROM datasheet describes the protocol as well.

Erik