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Section 17 I
2
C Bus Interface 3
R01UH0134EJ0400 Rev. 4.00 Page 883 of 2108
Sep 24, 2014
SH7262 Group, SH7264 Group
[10]
No
Yes
RDRF=1 ?
No
Yes
RDRF=1 ?
Last receive
- 1?
Master receive mode
Clear TEND in ICSR
Clear TRS in ICCR1 to 0
Clear TDRE in ICSR
Clear ACKBT in ICIER to 0
Dummy-read ICDRR
Read RDRF in ICSR
Read ICDRR
Set ACKBT in ICIER to 1
Set RCVD in ICCR1 to 1
Read ICDRR
Read RDRF in ICSR
Write 0 to BBSY
and SCP
Read STOP in ICSR
Read ICDRR
Clear RCVD in ICCR1 to 0
Clear MST in ICCR1 to 0
End
No
Yes
STOP=1 ?
No
Yes
[1] Clear TEND, select master receive mode, and then clear TDRE. *
1
[2] Set acknowledge to the transmit device. *
1
[3] Dummy-read ICDDR. *
1
[4] Wait for 1 byte to be received*
2
[5] Check whether it is the (last receive - 1).*
2
[6] Read the receive data.
[7] Set acknowledge of the final byte. Disable continuous reception (RCVD = 1).*
2
[8] Read the (final byte - 1) of received data.
[9] Wait for the last byte to be receive.
[10] Clear the STOP flag.
[11] Issue the stop condition.
[12] Wait for the creation of stop condition.
[13] Read the last byte of receive data.
[14] Clear RCVD.
[15] Set slave receive mode.
[1]
[2]
[3]
[4]
[5]
[6]
[7]
[8]
[9]
[11]
[12]
[13]
[14]
[15]
Notes: 1. Make sure that no interrupt will be generated during steps [1] to [3].
2. When the (last receive -1) is checked (when step [5] is approved), make
sure that no interrupt will be generated during steps [4], [5], and [7].
Clear STOP in ICSR
When the size of receive data is only one byte in reception,
steps [2] to [6] are skipped after step [1], before jumping to step [7].
The step [8] is dummy-read in ICDRR.
[Complement]
Figure 17.19 Sample Flowchart for Master Receive Mode