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RL78/G1A CHAPTER 13 SERIAL INTERFACE IICA
Figure 13-33. Example of Slave to Master Communication
(8-Clock Wait Is Selected for Master, 9-Clock Wait Is Selected for Slave) (2/3)
(2) Address ~ data ~ data
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)
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)
R
ACK
ACK
Master side
Bus line
Slave side
H
H
L
H
L
L
H
L
H
L
L
D
1
7 D
1
6D
1
5D
1
4D
1
3D
1
2D
1
1D
1
0
D
2
7
Note 1 Note 1
<5>
<7> <9>
Note 2
Note 2
<4> <8>
<11>
<10>
<12>
<6>
<3>
: Wait state by master device
: Wait state by slave device
: Wait state by master and slave devices
Notes 1. For releasing wait state during reception of a master device, write “FFH” to IICA0 or set the WREL0 bit.
2. Write data to IICA0, not setting the WREL0 bit, in order to cancel a wait state during transmission by a
slave device.
R01UH0305EJ0200 Rev.2.00 648
Jul 04, 2013