Product data

55
Read SCL pin
Write transmit data to ICDR
Clear IRIC in ICSR
Write BBSY = 1,
SCP = 0 (ICSR)
IRIC= 1 ?
No
SCL= Low ?
No
Yes
Start condition
issuance?
No
[1]
[2]
[3]
[4]
[5]
Note: Program so that processing from [3] to [5] is
executed continuously.
[1] Wait for end of 1-byte transfer.
[2] Determine whether SCL is low.
[3] Issue restart condition instruction for retransmission.
[4] Determine whether start condition is generated or not.
[5] Set transmit data (slave address + R/W).
Other processing
Yes
Yes
IRIC= 1 ?
No
Yes
Start condition
(retransmission)
SCL
bit7ACK
IRIC
[1] IRIC determination Determination
of SCL = low
[2]
[3] Start condition
instruction issuance
[4] IRIC
determination
[5]
SDA
ICDR write
(next transmit data)
Figure 16.19 Flowchart and Timing of Start Condition Instruction Issuance for
Retransmission