R01UH0822EJ0100 Rev.1.00
Page 798 of 1041
Jul 31, 2019
RX13T Group
24. I
2
C-bus Interface (RIICa)
24.14 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.
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 24.7
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