SH7261 datasheet(794/1348 Pages) RENESAS

794 / 1348 page

Section 17 I

2C Bus Interface 3 (IIC3)

Rev. 2.00 Sep. 07, 2007 Page 762 of 1312

REJ09B0320-0200

17.4.8

Example of Use

Flowcharts in respective modes that use the I

2C bus interface 3 are shown in figures 17.18 to

17.21.

BBSY=0 ?

TEND=1 ?

Yes

Start

[1]

[2]

[3]

[4]

[5]

[6]

[7]

[8]

[9]

[10]

[11]

[13]

[14]

[15]

Initialize

Set MST and TRS

in ICCR1 to 1

Write 1 to BBSY and 0 to SCP

Write transmit data in ICDRT

Write 0 to BBSY and SCP

Set MST and TRS

in ICCR1 to 0

Read BBSY in ICCR2

Read TEND in ICSR

Read ACKBR in ICIER

Master receive mode

Yes

ACKBR=0 ?

Write transmit data in ICDRT

Read TDRE in ICSR

Read TEND in ICSR

Clear TEND in ICSR

Read STOP in ICSR

Clear TDRE in ICSR

End

Write transmit data in ICDRT

Transmit

mode?

Yes

TDRE=1 ?

Last byte?

STOP=1 ?

Yes

TEND=1 ?

Yes

[1]

Test the status of the SCL and SDA lines.

[2]

Set master transmit mode.

[3]

Issue the start condition.

[4]

Set the first byte (slave address + R/

W) of transmit data.

[5]

Wait for 1 byte to be transmitted.

[6]

Test the acknowledge transferred from the specified slave device.

[7]

Set the second and subsequent bytes (except for the final byte) of transmit data.

[8]

Wait for ICDRT empty.

[9]

Set the last byte of transmit data.

[10] Wait for last byte to be transmitted.

[11] Clear the TEND flag.

[12] Clear the STOP flag.

[13] Issue the stop condition.

[14] Wait for the creation of stop condition.

[15] Set slave receive mode. Clear TDRE.

[12]

Clear STOP in ICSR

Figure 17.18 Sample Flowchart for Master Transmit Mode

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