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RL78/G1A CHAPTER 13 SERIAL INTERFACE IICA
Figure 13-25 shows the communication reservation timing.
Figure 13-25. Communication Reservation Timing
21 3456 21 3456789
SCLA0
SDAA0
Program processing
Hardware processing
Write to
IICA0
Set SPD0
and
INTIICA0
STT0 = 1
Communi-
cation
reservation
Set
STD0
Generate by master device with bus mastership
Remark IICA0: IICA shift register 0
STT0: Bit 1 of IICA control register 00 (IICCTL00)
STD0: Bit 1 of IICA status register 0 (IICS0)
SPD0: Bit 0 of IICA status register 0 (IICS0)
Communication reservations are accepted via the timing shown in Figure 13-26. After bit 1 (STD0) of the IICA
status register 0 (IICS0) is set to 1, a communication reservation can be made by setting bit 1 (STT0) of IICA
control register 00 (IICCTL00) to 1 before a stop condition is detected.
Figure 13-26. Timing for Accepting Communication Reservations
SCLA0
SDAA0
STD0
SPD0
Standby mode (Communication can be reserved by setting STT0 to 1 during this period.)
Figure 13-27 shows the communication reservation protocol.
R01UH0305EJ0200 Rev.2.00 605
Jul 04, 2013