CHAPTER 17 SERIAL INTERFACE IIC0
Preliminary User’s Manual U17260EJ3V1UD
438
Figure 17-20. Communication Reservation Timing
2
1
3
4
5
6
2
1
3
4
5
6
7
8
9
SCL0
SDA0
Program processing
Hardware processing
Write to
IIC0
Set SPD0
and
INTIIC0
STT0 = 1
Communi-
cation
reservation
Set
STD0
Generate by master device with bus mastership
Remark
IIC0:
IIC shift register 0
STT0: Bit 1 of IIC control register 0 (IICC0)
STD0: Bit 1 of IIC status register 0 (IICS0)
SPD0: Bit 0 of IIC status register 0 (IICS0)
Communication reservations are accepted via the following timing. After bit 1 (STD0) of IIC status register 0
(IICS0) is set to 1, a communication reservation can be made by setting bit 1 (STT0) of IIC control register 0
(IICC0) to 1 before a stop condition is detected.
Figure 17-21. Timing for Accepting Communication Reservations
SCL0
SDA0
STD0
SPD0
Standby mode
Figure 17-22 shows the communication reservation protocol.
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