UPD78F0838 Renesas Electronics Corporation., UPD78F0838 Datasheet - Page 479

• Manufacturer Part Number: UPD78F0838
• Description: 8-bit Single-chip Microcontrollers
• Manufacturer: Renesas Electronics Corporation.

14.5.6 Wait
receive data (i.e., is in a wait state).
canceled for both the master and slave devices, the next data transfer can begin.
The wait is used to notify the communication partner that a device (master or slave) is preparing to transmit or
Setting the SCL0 pin to low level notifies the communication partner of the wait state. When wait state has been
(1) When master device has a nine-clock wait and slave device has an eight-clock wait
(master transmits, slave receives, and ACKE0 = 1)
Transfer lines
Master
Slave
ACKE0
SDA0
SCL0
SCL0
SCL0
IIC0
IIC0
H
D2
CHAPTER 14 SERIAL INTERFACE IIC0
6
6
Master returns to high
impedance but slave
is in wait state (low level).
Preliminary User’s Manual U19748EJ1V0UD
Wait after output
of eighth clock
D1
7
7
Figure 14-18. Wait (1/2)
D0
8
8
Wait from slave
9
ACK
Wait after output
of ninth clock
9
FFH is written to IIC0 or WREL0 is set to 1
Wait from master
IIC0 data write (cancel wait)
D7
1
1
D6
2
2
D5
3
3
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