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2
Section 18 I
C Bus Interface (IIC)
SDA
SCL
1–7
S
SLA
2
Table 18.8 I
C Bus Data Format Symbols
Symbol
Description
S
Start condition. The master device drives SDA from high to low while SCL is high
SLA
Slave address. The master device selects the slave device.
R/W
Indicates the direction of data transfer: from the slave device to the master device
when R/W is 1, or from the master device to the slave device when R/W is 0
A
Acknowledge. The receiving device drives SDA low to acknowledge a transfer. (The
slave device returns acknowledge in master transmit mode, and the master device
returns acknowledge in master receive mode.)
DATA
Transferred data. The bit length of transferred data is set with the BC2 to BC0 bits in
ICMR. The MSB first or LSB first is switched with the MLS bit in ICMR.
P
Stop condition. The master device drives SDA from low to high while SCL is high
Rev. 1.00 Mar. 12, 2008 Page 618 of 1178
REJ09B0403-0100
8
9
1–7
R/W
A
DATA
Figure 18.5 I
8
9
1–7
A
2
C Bus Timing
8
9
DATA
A/A
P
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