RX610 Group
22. I
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C Bus Interface (RIIC)
R01UH0032EJ0120 Rev.1.20
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Feb 20, 2013
22.12.3 SMBus Host Notification Protocol/Notify ARP Master
In communications over an SMBus, a slave device can temporarily act as a master device to notify the SMBus host (or
ARP master) of (or request the SMBus host for) its own slave address or to request its own slave address from the
SMBus host.
For a product of the RX610 Group to operate as an SMBus host (or ARP master), the host address (0001 000b) sent from
the slave device must be detected as a slave address, so the RIIC has a function for detecting the host address. To detect
the host address as a slave address, set the SMBS bit in ICMR3 and the HOAE bit in ICSER to 1. Operation after the host
address has been detected is the same as normal slave operation.