SH7261 datasheet(788/1348 Pages) RENESAS

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Section 17 I

2C Bus Interface 3 (IIC3)

Rev. 2.00 Sep. 07, 2007 Page 756 of 1312

REJ09B0320-0200

17.4.5

Slave Receive Operation

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 bits CKS[3:0] in ICCR1. (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.)

3. Read ICDRR every time RDRF is set. If 8th receive clock pulse falls while RDRF is 1, SCL is

fixed low until ICDRR is read. The change of the acknowledge before reading ICDRR, to be

returned to the master device, is reflected to the next transmit frame.

4. The last byte data is read by reading ICDRR.

ICDRS

ICDRR

RDRF

Data 1

Data 2

Data 1

SCL

(Master output)

SDA

(Master output)

SDA

(Slave output)

SCL

(Slave output)

Bit 7

Bit 6

Bit 5

Bit 4

Bit 3

Bit 2

Bit 1

Bit 0

[2] Read ICDRR (dummy read)

[2] Read ICDRR

User

processing

Figure 17.11 Slave Receive Mode Operation Timing (1)

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