R01UH0823EJ0100 Rev.1.00 Page 1134 of 1823
Jul 31, 2019
RX23W Group 35. I
2
C-bus Interface (RIICa)
For 10-bit address format: SARUy.FS bit = 1
When the received slave address does not match a value of (11110b + SARUy.SVA[1:0] bits) with the
ICSER.SARyE bit set to 1 (slave address y detection enabled)
This flag is set to 0 at the rising edge of the ninth SCL clock cycle in the first byte.
When the received slave address matches a value of (11110b + SARUy.SVA[1:0] bits) and the following address
does not match the SARLy value with the ICSER.SARyE bit set to 1 (slave address y detection enabled)
This flag is set to 0 at the rising edge of the ninth SCL clock cycle in the second byte.
GCA Flag (General Call Address Detection Flag)
[Setting condition]
When the received slave address matches the general call address (0000 000b + 0 (write)) with the ICSER.GCAE
bit set to 1 (general call address detection is enabled)
This flag is set to 1 at the rising edge of the ninth SCL clock cycle in the first byte.
[Clearing conditions]
When 0 is written to the GCA flag after reading GCA flag to be 1
When a stop condition is detected
When the received slave address does not match the general call address (0000 000b + 0 (write)) with the
ICSER.GCAE bit set to 1 (general call address detection is enabled)
This flag is set to 0 at the rising edge of the ninth SCL clock cycle in the first byte.
When 1 is written to the ICCR1.IICRST bit to apply an RIIC reset or an internal reset
DID Flag (Device-ID Address Detection Flag)
[Setting condition]
When the first byte received immediately after a start condition or restart condition is detected matches a value of
(device ID (1111 100b) + 0 (write)) with the ICSER.DIDE bit set to 1 (device-ID address detection is enabled)
This flag is set to 1 at the rising edge of the ninth SCL clock cycle in the first byte.
[Clearing conditions]
When 0 is written to the DID flag after reading DID flag to be 1
When a stop condition is detected
When the first byte received immediately after a start condition or restart condition is detected does not match a
value of (device ID (1111 100b)) with the ICSER.DIDE bit set to 1 (device-ID address detection is enabled)
This flag is set to 0 at the rising edge of the ninth SCL clock cycle in the first byte.
When the first byte received immediately after a start condition or restart condition is detected matches a value of
(device ID (1111 100b) + 0 (write)) and the second byte does not match any of slave addresses 0 to 2 with the
ICSER.DIDE bit set to 1 (device-ID address detection is enabled)
This flag is set to 0 at the rising edge of the ninth SCL clock
cycle in the second byte.
When 1 is written to the ICCR1.IICRST bit to apply an RIIC reset or an in
ternal reset
HOA Flag (Host Address Detection Flag)
[Setting condition]
When the received slave address matches the host address (0001 000b) with the ICSER.HOAE bit set to 1 (host
address detection is enabled)
This flag is set to 1 at the rising edge of the ninth SCL clock cycle in the first byte.
[Clearing conditions]
When 0 is written to the HOA flag after reading HOA flag to be 1
When a stop condition is detected
When the received slave address does not match the host address (0001 000b) with the ICSER.HOAE bit set to 1
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