SH7670 Datasheet, PDF (892/1292 Pages) Renesas Technology Corp – 32-Bit RISC Microcomputer SuperHTM RISC engine Family / SH7670 Series

Section 19 I²C Bus Interface 3 (IIC3)
Master receive mode
Clear TEND in ICSR
Set TRS in ICCR1 to 0
Clear TDRE in ICSR
Set 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
Set RCVD in ICCR1 to 0
Read ICDRR
Read RDRF in ICSR
No
RDRF=1 ?
Yes
Clear STOP in ICSR
Write 0 to BBSY
and SCP
Read STOP in ICSR
No
STOP=1 ?
Yes
Read ICDRR
Clear RCVD in ICCR1 to 0
Set MST in ICCR1 to 0
End
[1] Clear TEND, select master receive mode, and then clear TDRE. *¹
[2] Set acknowledge to the transmit device. *¹
[1]
[3] Dummy-read ICDDR. *¹
[2]
[4] Wait for 1 byte to be received. *²
[5] Check whether it is the (last receive - 1). *²
[3]
[6] Read the receive data.
[4]
[7] Set acknowledge of the final byte. Disable continuous reception (RCVD = 1). *²
[8] Read the (final byte - 1) of received data.
[5]
[9] Wait for the last byte to be receive.
[10] Clear the STOP flag.
[6]
[11] Issue the stop condition.
[12] Wait for the creation of stop condition.
[7]
[13] Read the last byte of receive data.
[14] Clear RCVD.
[8]
[15] Set slave receive mode.
Notes: 1. Make sure that no interrupt will be generated during steps [1] to [3].
[9]
2. At last receive - 1 (when (5) is satisfied), ensure that no interrupt occurs
during the processing of (4), (5), or (7).
Supplementary information
[10]
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.
[11]
[12]
[13]
[14]
[15]
Figure 19.19 Sample Flowchart for Master Receive Mode
Rev. 1.00 Nov. 14, 2007 Page 866 of 1262
REJ09B0437-0100