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 1160 of 1852
Nov 30, 2020
RX23W Group 35. I
2
C-bus Interface (RIICa)
Figure 35.10 Example of Master Reception (7-Bit Address Format, 1 or 2 bytes)
Master reception starts
Initial settings
ICCR2.BBSY = 0?
ICCR2.ST = 1
ICSR2.TDRE = 1?
Write the ICDRT register
ICSR2.RDRF = 1?
ICSR2.NACKF = 0?
ICMR3.WAIT = 1
Next data = last byte?
Dummy read the ICDRR register
ICSR2.RDRF = 1?
Read the ICDRR register
ICSR2.RDRF = 1?
No
Yes
No
Yes
No
Yes
No
Yes
Yes
No
No
Yes
No
ICSR2.STOP = 0
Yes
ICCR2.SP = 1
Read the ICDRR register
ICMR3.WAIT = 0
ICSR2.STOP = 0
ICCR2.SP = 1
Dummy read the ICDRR register
ICSR2.STOP = 1?
No
Yes
ICSR2.NACKF = 0
ICSR2.STOP = 0
Master reception ends
(1) Initial settings
(2) Check I
2
C-bus occupation and generate a start condition.
(3) Transmit the slave address followed by
R and check ACK.
(4) Set to WAIT
(5) Set to NACK
(When receiving 2 bytes, perform dummy
read.)
(6) Read received data
(When receiving 1 byte, perform
dummy read.)
(7) Read the last data,
release SCL by the ACKBT bit setting,
and generate a stop condition.
(8) Confirm that the stop condition
has been generated.
(9) Processing for the next transfer operation
Set ICMR3.ACKBT bit