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User’s Manual U11969EJ3V0UM00
CHAPTER 8 SERIAL INTERFACE FUNCTION
(6) Wait signal (WAIT)
The wait signal is a signal by which the master or the slave informs the other that it is preparing for transmitting/
receiving data (wait status).
The master of the slave informs the wait status to the other by inputting the low level to the SCL pin. Both
the master and slave can start the next transfer when the wait status is released.
Figure 8-20. Wait Signal (1/2)
(1) When the master is 9-clock wait, and the slave is 8-clock wait
(master: transmission, slave: reception, ACKE = 1)
6
7
8
1
2
3
9
SCL
6
7
8
1
2
3
9
D2
D1
D0
D7
D6
D5
ACK
SCL
SDA
IIC
Master
Slave
Transfer line
Slave is waiting (low level)
while master returns to Hi-Z
Waits after outputting
the ninth clock
IIC
←
data (wait released)
SCL
ACKE
H
IIC
Waits after outputting
the eighth clock
IIC
←
FFH (wait released) or WREL
←
1
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