R01UH0823EJ0100 Rev.1.00 Page 1137 of 1823
Jul 31, 2019
RX23W Group 35. I
2
C-bus Interface (RIICa)
[Setting conditions]
When master arbitration-lost detection is enabled: ICFER.MALE = 1
When the internal SDA output state does not match the SDA0 line level at the rising edge of SCL clock except for
the ACK period during data (including slave address) transmission in master transmit mode (when the SDA0 line is
driven low while the internal SDA output is at a high level (the SDA0 pin is in the high-impedance state))
When a start condition is detected while the ICCR2.ST bit is 1 (start condition issuance request) or the internal SDA
output state does not match the SDA0 line level
When the ICCR2.ST bit is set to 1 (start condition issuance request) with the ICCR2.BBSY flag set to 1.
When NACK arbitration-lost detection is enabled: ICFER.NALE = 1
When the internal SDA output state does not match the SDA0 line level at the rising edge of SCL clock in the ACK
period during NACK transmission in receive mode
When slave arbitration-lost detection is enabled: ICFER.SALE = 1
When the internal SDA output state does not match the SDA0 line level at the rising edge of SCL clock except for
the ACK period during data transmission in slave transmit mode
[Clearing conditions]
When 0 is written to the AL flag after reading AL = 1
When 1 is written to the ICCR1.IICRST bit to apply an RIIC reset or an internal reset
×: Don’t care
START Flag (Start Condition Detection Flag)
[Setting condition]
When a start condition (or a restart condition) is detected
[Clearing conditions]
When 0 is written to the START bit after reading START = 1
When a stop condition is detected
When 1 is written to the ICCR1.IICRST bit to apply an RIIC reset or an internal reset
STOP Flag (Stop Condition Detection Flag)
[Setting condition]
When a stop condition is detected
[Clearing conditions]
When 0 is written to the STOP bit after reading STOP = 1
When 1 is written to the ICCR1.IICRST bit to apply an RIIC reset or an internal reset
Table 35.4 Relationship between Arbitration-Lost Generation Sources and Arbitration-Lost Enable Functions
ICFER ICSR2
Error Arbitration-Lost Generation SourceMALE NALE SALE AL
1 × × 1 Start condition
issuance error
When internal SDA output state does not match SDA0 line level when a
start condition is detected while the ICCR2.ST bit is 1
When ICCR2.ST bit is set to 1 with ICCR2.BBSY flag set to 1
1 Transmit data
mismatch
When transmit data (including slave address) does not match the bus
state in master transmit mode
×1×1NACK
transmission
mismatch
When ACK is detected during transmission of NACK in master receive
mode or slave receive mode
× × 1 1 Transmit data
mismatch
When transmit data does not match the bus state in slave transmit mode
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