Event from I2C driver indicating successful recipt of valid command byte causes transition to S10. The state transition function used is "STF_S_rd_cmd".

Event from I2C driver indicating failure OR command byte received but addressed to other CPU causes transition to S15. The state transition function used is "STF_S_wait_for_stop"

Event from I2C driver indicating unexpected stop condition seen causes transition to S1. The state transition function used is "STF_S_ready"