Section 17 I2C Bus Interface 2 (IIC2)
Mater receive mode
[1] Clear TEND, select master receive mode, and then clear TDRE.*
Clear TEND in ICSR
Clear TRS in ICCR1 to 0
Clear TDRE in ICSR
[2] Set acknowledge to the transmit device.*
[3] Dummy-read ICDDR.*
[1]
[4] Wait for 1 byte to be received
Clear ACKBT in ICIER to 0
Dummy-read ICDRR
[2]
[3]
[5] Check whether it is the (last receive - 1).
[6] Read the receive data last.
Read RDRF in ICSR
No
[7] Set acknowledge of the final byte. Disable continuous reception (RCVD = 1).
[8] Read the (final byte - 1) of receive data.
[9] Wait for the last byte to be receive.
[10] Clear the STOP flag.
[4]
RDRF=1 ?
Yes
Yes
Last receive
- 1?
[5]
[6]
No
Read ICDRR
[11] Issue the stop condition.
[12] Wait for the creation of stop condition.
[13] Read the last byte of receive data.
[14] Clear RCVD.
Set ACKBT in ICIER to 1
Set RCVD in ICCR1 to 1
[7]
[8]
[9]
[15] Set slave receive mode.
Read ICDRR
Read RDRF in ICSR
No
RDRF=1 ?
Yes
[10]
[11]
Clear STOP in ICSR.
Write 0 to BBSY
and SCP
Read STOP in ICSR
STOP=1 ?
[12]
No
Yes
[13]
[14]
Read ICDRR
Clear RCVD in ICCR1 to 0
[15]
Clear MST in ICCR1 to 0
End
Note: Do not activate an interrupt during the execution of steps [1] to [3].
Supplementary explanation: When one byte is received, steps [2] to [6] are
skipped after step [1], before jumping to step [7].
The step [8] is dummy-read in ICDRR.
Figure 17.18 Sample Flowchart for Master Receive Mode
Rev. 3.00 Sep. 10, 2007 Page 359 of 528
REJ09B0216-0300
RENESAS [ RENESAS TECHNOLOGY CORP ]
