The basic byte-based messaging schemes of I²C and SPI map easily onto I3C. Additionally, a set of common command codes (CCCs) has been defined for standard operations like enabling and disabling events, managing I3C specific features (dynamic addressing, timing control, etc.), and others. CCCs can be either broadcasted (sent to all devices on the bus), or directed at a specific device on the bus.

CCCs do not interfere with, and do not use up any of the message space of, normal Master-to -Slave communications. I3C provides a separate namespace for CCCs.

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