The ADuC702x parts contain 2 x full I2C compatible interfaces.
Note, the I2C interface on the ADuC7023 is not included in this answer.
The following limitations are present though:
1) In Master mode, the ADuC702x cannot generate a Repeated Start. In slave mode however, a Repeated Start is fully supported.
2) In Slave mode, the I2C interface cannot be programmed to return a "NACK" to the Master instead of an "ACK" to support the validation of checksums.
3) The I2C1 channel does not support an IRQ or FIQ source when in Slave mode. I2C0 channel supports a Master and Slave IRQ/FIQ source.