R01UH0823EJ0100 Rev.1.00 Page 1187 of 1823
Jul 31, 2019
RX23W Group 35. I
2
C-bus Interface (RIICa)
35.14 Initialization of Registers and Functions When a Reset is Issued or a Condition is
Detected
The RIIC can be reset by MCU reset, RIIC reset, and internal reset functions. Table 35.7 lists the reset states of registers
and functions when a reset is issued or a condition is detected.
To be reset: Registers and functions are initialized.
Retained: Registers and functions are not initialized, but retained or updated according to the state.
Table 35.7 Reset States of Registers and Functions When a Reset is Issued or a Condition is Detected
MCU Reset
RIIC Reset
(ICE = 0, IICRST = 1)
Internal Reset
(ICE = 1, IICRST = 1)
Start Condition/
Restart Condition
Detection
Stop Condition
Detection
ICCR1 ICE, IICRST To be reset Retained Retained Retained Retained
SCLO, SDAO To be reset To be reset
Others Retained
ICCR2 BBSY To be reset To be reset Retained Retained Retained
ST, RS To be reset To be reset
TRS, MST Retained To be reset
SP To be reset
ICMR1 BC[2:0] To be reset To be reset To be reset To be reset Retained
Others Retained Retained
ICMR2 To be reset To be reset Retained Retained Retained
ICMR3 ACKBT To be reset To be reset Retained Retained To be reset
Others Retained
ICFER To be reset To be reset Retained Retained Retained
ICSER To be reset To be reset Retained Retained Retained
ICIER To be reset To be reset Retained Retained Retained
ICSR1 To be reset To be reset To be reset Retained To be reset
ICSR2 TDRE, TEND To be reset To be reset To be reset Retained To be reset
START
Others Retained
SARL0, SARL1, SARL2,
SARU0, SARU1, SARU2
To be reset To be reset Retained Retained Retained
ICBRH, ICBRL To be reset To be reset Retained Retained Retained
ICDRT To be reset To be reset Retained Retained Retained
ICDRR To be reset To be reset Retained Retained Retained
ICDRS To be reset To be reset To be reset Retained Retained
Timeout function To be reset To be reset To be reset Operation Operation
Bus free time
measurement
To be reset To be reset Operation Operation Operation
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