RL78/G1H CHAPTER 15 SERIAL INTERFACE IICA
R01UH0575EJ0120 Rev. 1.20 Page 454 of 920
Dec 22, 2016
15.5.6 Wait
The wait is used to notify the communication partner that a device (master or slave) is preparing to transmit or
receive data (i.e., is in a wait state).
Setting the SCLAn pin to low level notifies the communication partner of the wait state. When wait state has been
canceled for both the master and slave devices, the next data transfer can begin.
Figure 15 - 25 Wait (1/2)
(1) When master device has a nine-clock wait and slave device has an eight-clock wait
(master transmits, slave receives, and ACKEn = 1)
Remark n = 0, 1
IICAn
SCLAn
IICAn
SCLAn
ACKEn
SCLAn
SDAAn
6
Master returns to high
impedance but slave
is in wait state (low level).
IICAn data write (cancel wait)
Wait after output
of eighth clock
Wait from slave
Wait from master
FFH is written to IICAn or WRELn is set to 1
D2 ACK
H
789 123
678 9
123
D1 D0 D7 D6 D5
Wait after output
of ninth clock
Master
Slave
Transfer lines
To Next Page
Loading...
Need help?
General
