HD6432633 Datasheet, PDF (907/1453 Pages) Renesas Technology Corp – Series of Microcomputers (MCUs: microcomputer units)

• Notes on Start Condition Issuance for Retransmission
Figure 18-22 shows the timing of start condition issuance for retransmission, and the timing for
subsequently writing data to ICDR, together with the corresponding flowchart.
IRIC= 1 ?
No
Yes
Clear IRIC in ICSR
Start condition
No
issuance?
Yes
Read SCL pin
SCL= Low ?
No
[1]
Other processing
[2]
[1] Wait for end of 1-byte transfer.
[2] Determine whether SCL is low.
[3] Issue restart condition instruction for retransmission.
[4] Determine whether SCL is high.
[5] Set transmit data (slave address + R/W).
Note: Program so that processing from [3] to [5] is
executed continuously.
Yes
Write BBSY = 1,
SCP = 0 (ICSR)
[3]
Read SCL pin
SCL= High ?
No
[4]
Yes
Write transmit data to ICDR
[5]
SCL
SDA
ACK
IRIC
Start condition
(retransmission)
Bit 7
[1] IRIC determination [2] Determination
of SCL = low
[4] Determination
of SCL = high
[3] Start condition
instruction issuance
[5] ICDR write
Figure 18-22 Flowchart and Timing of Start Condition Instruction Issuance for
Retransmission
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