SH7080 Datasheet, PDF (996/1644 Pages) Renesas Technology Corp – 32-Bit RISC Microcomputer SuperH™ RISC engine Family

Section 18 I²C Bus Interface 2 (I²C2)
Slave receive mode
Clear AAS in ICSR
Clear ACKBT in ICIER to 0
Dummy-read ICDRR
Read RDRF in ICSR
No
RDRF=1 ?
Yes
Last receive
- 1?
Yes
No
Read ICDRR
[1] Clear the AAS flag.
[1]
[2] Set acknowledge to the transmit device.
[2]
[3] Dummy-read ICDRR.
[3]
[4] Wait for 1 byte to be received.
[5] Check whether it is the (last receive - 1).
[4]
[6] Read the receive data.
[7] Set acknowledge of the last byte.
[5]
[8] Read the (last byte - 1) of receive data.
[9] Wait the last byte to be received.
[6]
[10] Read for the last byte of receive data.
Set ACKBT in ICIER to 1
Read ICDRR
Read RDRF in ICSR
No
RDRF=1 ?
Yes
Read ICDRR
End
Note: When the size of receive data is only one byte in
[7]
reception, steps [2] to [6] are skipped after
step [1], before jumping to step [7]. The step [8]
is dummy-read in ICDRR.
[8]
However, when the size of receive data is two
bytes and more, steps [2] to [6] are not skipped
after step [1].
[9]
[10]
Figure 18.21 Sample Flowchart for Slave Receive Mode
Rev. 3.00 May 17, 2007 Page 938 of 1582
REJ09B0181-0300