SH7721 datasheet(727/1524 Pages) RENESAS

727 / 1524 page

Section 20

2C Bus Interface (IIC)

Rev. 3.00 Jan. 18, 2008 Page 665 of 1458

REJ09B0033-0300

RDRF

RCVD

ICDRS

ICDRR

Data n-1

Data n

Data n-1

[5] Read ICDRR after setting RCVD

[6] Issue stop

condition

[7] Read ICDRR,

and clear RCVD

[8] Set slave

receive mode

SCL

(Master output)

SDA

(Master output)

SDA

(Slave output)

Bit 7

Bit 6

Bit 5

Bit 4

Bit 3

Bit 2

Bit 1

Bit 0

User

processing

Figure 20.8

Master Receive Mode Operation Timing (2)

20.4.4

Slave Transmit Operation

In slave transmit mode, the slave device outputs the transmit data, while the master device outputs

the receive clock and returns an acknowledge signal. For slave transmit mode operation timing,

refer to figures 20.9 and 20.10.

The transmission procedure and operations in slave transmit mode are described below.

1. Set the ICE bit in ICCR1 to 1. Set the MLS bit in ICMR and the CKS4 to CKS0 bits in

ICCKS1 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 this time, if the 8th bit data (R/

W) is 1, the TRS and ICSR bits in ICCR1 are

set to 1, and the mode changes to slave transmit mode automatically. The continuous

transmission is performed by writing transmit data to ICDRT every time TDRE is set.

3. If TDRE is set after writing last transmit data to ICDRT, wait until TEND in ICSR is set to 1,

with TDRE = 1. When TEND is set, clear TEND.

4. Clear TRS for the end processing, and read ICDRR (dummy read). SCL is free.

5. Clear TDRE.

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