Datasheet

Section 15 I
2
C Bus Interface (IIC)
Rev. 3.00 Sep. 28, 2009 Page 398 of 710
REJ09B0384-0300
SDA
IRIC
SCL
ACK
Bit 7
[3] (Retransmission) Start condition instruction issuance
[4] IRIC determination
[5] ICDR write (transmit data)
[2] Determination of SCL = Low
[1] IRIC determination
Start condition generation
(retransmission)
IRIC = 1?
Yes
Clear IRIC in ICCR
Read SCL pin
Write transmit data to ICDR
Set BBSY = 1,
SCP = 0 (ICCR)
[1]
[1] Wait for end of 1-byte transfer
[2] Determine whether SCL is low
[3] Issue start condition instruction for retransmission
[4] Determine whether start condition is generated or not
[5] Set transmit data (slave address + R/W)
[2]
[3]
[4]
[5]
Yes
No
No
IRIC = 1?
Yes
SCL = Low?
No
Note: Program so that processing from [3] to [5]
is executed continuously.
9
Figure 15.30 Flowchart for Start Condition Issuance Instruction
for Retransmission and Timing
Note: This restriction on usage can be canceled by setting the FNC1 and FNC0 bits to B′11 in
ICXR.