Hello Steve, RIIC is fully-featured, dedicated I2C peripheral capable of running as a slave and up to "fast mode plus" (1Mbps) frequency. SCI I2C (i.e. Simple IIC) uses our standard serial peripheral and can only run as bus master and up to 400kbps (fast mode). For most applications SCI I2C is sufficient. You can read more about the two peripherals in S7G2 User's Manual, sections 34 (SCI) and 36 (RIIC). Regards
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