HD64F3437TF16 Datasheet, PDF (341/752 Pages) Hitachi Semiconductor – 12 V must not be applied to the S-mask model (single-power-supply specification), as this may permanently damage the device.

Read IRIC in ICSR
IRIC = 1?
(1) Confirm completion of 1-
byte transmission
(2) Confirm that SCL is low
Clear IRIC in ICSR
Retransmission?
No _{Other operation}
(3) Issue retransmission
start condition
(4) Confirm that SCL is high
Yes
Read SCL
No
SCL = 0?
(5) Write transmit data
Note: “Read SCL” means
reading DR for the
SCL pin.
Yes
Write 1 to BBSY and
0 to SCP in ICSR
Read SCL
No
SCL = 1?
Yes
Write data to ICDR
Figure 13.16 Recommended Program Flow for Retransmission Start Condition Issuance
SCL
SDA
IRIC
9
ACK
Bit 7
(1) IRIC check (2) SCL low level
determination
(4) SCL high level
determination
(3) Retransmission start
condition issuance
(5) Transmit data setting
Figure 13.17 Timing Chart for Retransmission Start Condition Issuance
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