Users Manual
Table Of Contents
- 34. IrDA Interface
- 35. I2C-bus Interface (RIICa)
- 35.1 Overview
- 35.2 Register Descriptions
- 35.2.1 I2C-bus Control Register 1 (ICCR1)
- 35.2.2 I2C-bus Control Register 2 (ICCR2)
- 35.2.3 I2C-bus Mode Register 1 (ICMR1)
- 35.2.4 I2C-bus Mode Register 2 (ICMR2)
- 35.2.5 I2C-bus Mode Register 3 (ICMR3)
- 35.2.6 I2C-bus Function Enable Register (ICFER)
- 35.2.7 I2C-bus Status Enable Register (ICSER)
- 35.2.8 I2C-bus Interrupt Enable Register (ICIER)
- 35.2.9 I2C-bus Status Register 1 (ICSR1)
- 35.2.10 I2C-bus Status Register 2 (ICSR2)
- 35.2.11 Slave Address Register Ly (SARLy) (y = 0 to 2)
- 35.2.12 Slave Address Register Uy (SARUy) (y = 0 to 2)
- 35.2.13 I2C-bus Bit Rate Low-Level Register (ICBRL)
- 35.2.14 I2C-bus Bit Rate High-Level Register (ICBRH)
- 35.2.15 I2C-bus Transmit Data Register (ICDRT)
- 35.2.16 I2C-bus Receive Data Register (ICDRR)
- 35.2.17 I2C-bus Shift Register (ICDRS)
- 35.3 Operation
- 35.4 SCL Synchronization Circuit
- 35.5 SDA Output Delay Function
- 35.6 Digital Noise Filters
- 35.7 Address Match Detection
- 35.8 Automatic Low-Hold Function for SCL
- 35.9 Arbitration-Lost Detection Functions
- 35.10 Start Condition/Restart Condition/Stop Condition Generating Function
- 35.11 Bus Hanging
- 35.12 SMBus Operation
- 35.13 Interrupt Sources
- 35.14 Initialization of Registers and Functions When a Reset is Applied or a Condition is Detected
- 35.15 Event Link Function (Output)
- 35.16 Usage Notes
- 36. CAN Module (RSCAN)
R01UH0823EJ0110 Rev.1.10 Page 1181 of 1852
Nov 30, 2020
RX23W Group 35. I
2
C-bus Interface (RIICa)
Figure 35.32 Automatic Low-Hold Operation in Receive Mode (Using RDRFS and WAIT Bits)
RDRF
Read ICDRR register
RDRF
Data
Automatic low-hold (WAIT)
Automatic low-hold (WAIT)
ACK
Data Data
[RDRFS = 0, WAIT = 0]
Read ICDRR register
Read ICDRR register Read ICDRR register
[RDRFS = 0, WAIT = 1]
Automatic low-
hold (WAIT)
Data Data
ACK Data
Read ICDRR resgisterRead ICDRR register
Automatic low-hold
(to prevent failure to
receive data)
Automatic low-
hold (RDRFS)
Automatic low-hold (RDRFS)
[RDRFS = 1, WAIT = 0]
[RDRFS = 1, WAIT = 1]
Write 0 to ACKBT bit
Read ICDRR register
Read ICDRR register Write 0 to ACKBT bit
ACK
Data ACK Data
ACK
Automatic low-hold
(RDRFS)
Automatic low-hold (WAIT)
Automatic low-hold
(RDRFS)
Write 0 to ACKBT bit Read ICDRR register Read ICDRR register Write 0 to ACKBT bit
234567 81 234234567 8199 91
234567 81234567 8199 91
234567 8 91234567 819
234567 8 919 234567 81
Automatic low-hold
(to prevent failure to receive data)
ACK
ACK ACK ACK
RDRF
ACKBT
RDRF
ACKBT
Data
ACK
SCL0
SDA0
SCL0
SDA0
SCL0
SDA0
SCL0
SDA0