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Section 17 I
2
C Bus Interface 3
Page 882 of 2108 R01UH0134EJ0400 Rev. 4.00
Sep 24, 2014
SH7262 Group, SH7264 Group
17.4.8 Example of Use
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
Figure 17.18 Sample Flowchart for Master Transmit Mode