Renesas RL78 Series User Manual page 579

RL78/G1D
Figure 14-25 shows the communication reservation timing.
Program processing
Hardware processing
SCLAn
1 2
SDAAn
Remark IICAn:
STTn:
STDn: Bit 1 of IICA status register n (IICSn)
SPDn: Bit 0 of IICA status register n (IICSn)
Communication reservations are accepted via the timing shown in Figure 14-26. After bit 1 (STDn) of the IICA status
register n (IICSn) is set to 1, a communication reservation can be made by setting bit 1 (STTn) of IICA control register
n0 (IICCTLn0) to 1 before a stop condition is detected.
SCLAn
SDAAn
STDn
SPDn
Standby mode (Communication can be reserved by setting STTn to 1 during this period.)
Remark n = 0
Figure 14-27 shows the communication reservation protocol.
R01UH0515EJ0120 Rev.1.20
Dec 16, 2016
Figure 14-25. Communication Reservation Timing
STTn = 1
Communi-
cation
reservation
3 4 5 6 7
IICA shift register n
Bit 1 of IICA control register n0 (IICCTLn0)
Figure 14-26. Timing for Accepting Communication Reservations
CHAPTER 14 SERIAL INTERFACE IICA
Write to
IICAn
Set SPDn
and
INTIICAn
8 9
Generate by master device with bus mastership
Set
STDn
1 2 3 4 5 6
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