RL78/G13 CHAPTER 13 SERIAL INTERFACE IICA
R01UH0146EJ0100 Rev.1.00 776
Sep 22, 2011
Figure 13-32. Example of Master to Slave Communication
(9-Clock Wait Is Selected for Master, 9-Clock Wait Is Selected for Slave) (4/4)
(4) Data ~ restart condition ~ address
L
H
L
H
L
H
IICA0
STT0
(ST trigger)
SPT0
(SP trigger)
ACKD0
(ACK detection)
WTIM0
(8 or 9 clock wait)
ACKE0
(ACK control)
MSTS0
(communication status)
TRC0
(transmit/receive)
SCLA0 (bus)
(clock line)
WREL0
(wait cancellation)
INTIICA0
(interrupt)
SDAA0 (bus)
(data line)
AD6
IICA0
STD0
(ST detection)
SPD0
(SP detection)
ACKD0
(ACK detection)
WTIM0
(8 or 9 clock wait)
ACKE0
(ACK control)
MSTS0
(communication status)
TRC0
(transmit/receive)
WREL0
(wait cancellation)
INTIICA0
(interrupt)
Master side
Bus line
Slave side
Slave address
D
1
3
ACK
<i>
L
H
H
L
H
Restart condition
D
1
2 D
1
1 D
1
0
AD5 AD4 AD3 AD2
AD1
<ii>
<iii>
<7>
<8>
Note 2
Note 1
: Wait state by master device
: Wait state by slave device
: Wait state by master and slave devices
Notes 1. Make sure that the time between the rise of the SCLA0 pin signal and the generation of the start
condition after a restart condition has been issued is at least 4.7
μ
s when specifying standard mode and
at least 0.6
μ
s when specifying fast mode.
2. For releasing wait state during reception of a slave device, write “FFH” to IICA0 or set the WREL0 bit.
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