SH7730 Datasheet, PDF (653/1188 Pages) Renesas Technology Corp – Renesas 32-Bit RISC Microcomputer SuperHTM RISC engine Family / SH7780 Series

Section 20 I2C Bus Interface (IIC)
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
Yes
- 1?
No
Read ICDRR
Set ACKBT in ICIER to 1
Read ICDRR
Read RDRF in ICSR
No
RDRF=1 ?
Yes
Read ICDRR
End
[1]
[1] Clear the AAS flag.
[2]
[2] Set acknowledge to the transmit device.
[3]
[3] Dummy-read ICDRR.
[4] Wait for 1 byte to be received.
[4]
[5] Check whether it is the (last receive - 1).
[6] Read the receive data.
[7] Set acknowledge of the last byte.
[5]
[8] Read the (last byte - 1) of receive data.
[6]
[9] Wait the last byte to be received.
[10] Read for the last byte of receive data.
[7]
Note: When the size of receive data is only one byte in
reception, steps [2] to [6] are skipped after
[8]
step [1], before jumping to step [7]. The step [8]
is dummy-read in ICDRR.
[9]
[10]
Figure 20.17 Sample Flowchart for Slave Receive Mode
Rev. 1.00 Sep. 19, 2007 Page 605 of 1136
REJ09B0359-0100