Section 17 I2C Bus Interface 2 (IIC2)
Slave receive
mode
Slave transmit mode
SCL
(Master output)
9
1
2
3
4
5
6
7
8
9
SDA
(Master output)
A
A
SCL
(Slave output)
SDA
(Slave output)
Bit 7
Bit 6
Bit 5
Bit 4
Bit 3
Bit 2
Bit 1
Bit 0
TDRE
TEND
TRS
ICDRT
ICDRS
ICDRR
Data n
User
processing
[5] Clear TDRE
[4] Read ICDRR (dummy read)
after clearing TRS
[3] Clear TEND
Figure 17.10 Slave Transmit Mode Operation Timing (2)
Slave Receive Operation
17.4.5
In slave receive mode, the master device outputs the transmit clock and transmit data, and the
slave device returns an acknowledge signal. For slave receive mode operation timing, refer to
figures 17.11 and 17.12. The reception procedure and operations in slave receive mode are
described below.
1. Set the ICE bit in ICCR1 to 1. Set the MLS and WAIT bits in ICMR and the CKS3 to CKS0
bits in ICCR1 to 1. (Initial setting) Set the MST and TRS bits in ICCR1 to select slave receive
mode, and wait until the slave address matches.
2. When the slave address matches in the first frame following detection of the start condition,
the slave device outputs the level specified by ACKBT in ICIER to SDA, at the rise of the 9th
clock pulse. At the same time, RDRF in ICSR is set to read ICDRR (dummy read). (Since the
read data show the slave address and R/W, it is not used.)
Rev. 3.00 Sep. 10, 2007 Page 352 of 528
REJ09B0216-0300
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