
CHAPTER 16 SERIAL INTERFACE IICA
User’s Manual U19780EJ2V0UD
495
Figure 16-32. Example of Master to Slave Communication
(When 9-Clock Wait Is Selected for Both Master and Slave) (1/3)
(1) Start condition ~ address
IICA
ACKD0
STD0
SPD0
WTIM0
H
H
L
L
L
L
H
H
L
L
ACKE0
MSTS0
STT0
SPT0
WREL0
INTIICA0
TRC0
IICA
ACKD0
STD0
SPD0
WTIM0
ACKE0
MSTS0
STT0
SPT0
WREL0
INTIICA0
TRC0
SCLA0
SDAA0
1
2
3
4
5
6
7
8
9
4
3
2
1
AD6 AD5 AD4 AD3 AD2 AD1 AD0
W
ACK
D4
D5
D6
D7
Note 2
Processing by master device
Transfer lines
Processing by slave device
IICA
←
address
IICA
←
data
Note 1
IICA
←
FFH
Note 2
Transmit
Start condition
Receive
Notes 1.
Write data to IICA, not setting WREL0, in order to cancel a wait state during master transmission.
2.
To cancel slave wait, write “FFH” to IICA or set WREL0.