SH7720 Datasheet, PDF (736/1524 Pages) Renesas Technology Corp – Renesas 32-Bit RISC Microcomputer SuperHTM RISC engine Family / SH7700 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
- 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
[7]
Read ICDRR
[8]
Read RDRF in ICSR
No
RDRF=1 ?
Yes
Read ICDRR
End
Figure 20.17
[9]
[10]
Note: When one byte is received, steps [2] to [6] are skipped; step [7]
is executed after step [1]. Setp [8] is ICDRR dummy read.
Sample Flowchart for Slave Receive Mode
Rev. 3.00 Jan. 18, 2008 Page 674 of 1458
REJ09B0033-0300