R01UH0823EJ0100 Rev.1.00
Page 1154 of 1823
Jul 31, 2019
RX23W Group
35. I
2
C-bus Interface (RIICa)
Figure 35.12
Master Receive Operation Timing (1) (7-Bit Address Format, When RDRFS bit is 0)
Figure 35.13
Master Receive Operation Timing (2) (10-Bit Address Format, When RDRFS bit is 0)
Read ICDRR register
(Dummy read)
Read ICDRR register
(DATA 1)
Write data to ICDRT register
(7-bit a R)
Write 1
to ST bit
X (ACK/NACK)
0 (ACK)
XXXX (Initial value/last data for reception)
XXXX (Initial value/last data for reception)
7-bit a R
Transmit data (7-bit a R)
7-bit slave address
Automatic low hold
(to prevent wrong transmission)
TDRE
MST
TRS
BBSY
TEND
S
9
ST
START
ICDRT
ICDRS
DATA 1
DATA 2
1
b7
R
2
b6
3
b5
4
b4
5
b3
6
b2
7
b1
2
b6
4
b4
5
b3
6
b2
7
b1
3
b5
8
b0
1
b7
2
b6
4
b4
3
b5
DATA 1
DATA 2
1
b7
RDRF
ICDRR
DATA 1
9
8
b0
Master transmit mode
Master receive mode
ACKBT
ACKBR
[3]
[4]
[5]
[2]
0 (ACK)
0 (ACK)
ACK
Receive data (7-bit a R)
7-bit a R
ACK
Receive data (DATA 1)
SCL0
SDA0
Write 1
to ST bit
Write data to ICDRT
register
( 2 bits + R)
0 (ACK)
XXXX (Initial value/last data for reception)
XXXX (Initial value/last data for reception)
Upper 10 bits + R
Upper 10 bits + R
Master transmit mode
Master receive mode
Automatic low hold (to prevent wrong transmission)
Read ICDRR register
(Dummy read)
Upper 10 bits + W
TDRE
MST
TRS
BBSY
TEND
S
ST
START
ICDRT
ICDRS
DATA 1
W
7
b1
1
b7
2
b6
4
b4
3
b5
DATA 1
RDRF
ICDRR
Upper 10-bit addresses ( 2 bits)
R
9
8
b0
2
b6
3
b5
4
b4
5
b3
1
b7
6
b2
Sr
1 to 8
9
9
8
b0
1 to 7
b7
b1
Lower 10 bits
Upper 10 bits
RS
ACKBT
ACKBR
[3]
[4]
[2]
Upper 10 bits + W
Lower 10 bits
0 (ACK)
0 (ACK)
0 (ACK)
Write 1
to RS bit
Clear
START flag
Write data to
ICDRT register
(lower 8 bits)
Write data to ICDRT
register
( 2 bits + W)
Transmit data (lower 10 bits)
Transmit data (upper 10 bits + W)
Transmit data (upper 10 bits + R)
Transmit data (upper 10 bits + R)
ACK
ACK
ACK
X (ACK/NACK)
Lower 10 bits
b7
b0
SCL0
SDA0