Renesas R5S72623 Manual De Usuario

 
Section 17   I

2

C Bus Interface 3 

Page 882 of 2108 

 

R01UH0134EJ0400  Rev. 4.00 

 

 Sep 

24, 

2014 

SH7262 Group, SH7264 Group

Flowcharts in respective modes that use the I

2

C bus interface 3 are shown in figures 17.18 to 

17.21. 

BBSY=0 ?

No

TEND=1 ?

No

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?

No

Yes

TDRE=1 ?

Last byte?

STOP=1 ?

No

No

No

No

No

Yes

Yes

TEND=1 ?

Yes

Yes

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