CHAPTER 10 SERIAL INTERFACE FUNCTION
User’s Manual U13850EJ4V0UM
275
Figure 10-23. Wait Signal (2/2)
(b) When master and slave devices both have a nine-clock wait
(master: transmission, slave: reception, and ACKEn = 1)
SCL
6
SDA
7
8
9
1
2
3
SCL
IIC0
6
H
7
8
1
2
3
D2
D1
D0
ACK
D7
D6
D5
9
IIC0
SCL
ACKE
Master
Master and slave both wait
after output of ninth clock.
IIC0 data write (cancel wait)
Slave
FFH is written to IIC0 or WREL is set to 1.
Output according to previously set ACKE value
Transfer lines
Remarks 1.
ACKEn:
Bit 2 of IIC control register n (IICCn)
WRELn: Bit 5 of IIC control register n (IICCn)
2.
n = 0, 1
A wait may be automatically generated depending on the setting for bit 3 (WTIMn) of IIC control register n
(IICCn) (n = 0, 1).
Normally, when bit 5 (WRELn) of IICCn is set to 1 or when FFH is written to IIC shift register n (IICn), the wait
status is canceled and the transmitting side writes data to IICn to cancel the wait status.
The master device can also cancel the wait status via either of the following methods.
• By setting bit 1 (STTn) of IICCn to 1
• By setting bit 0 (SPTn) of IICCn to 1
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