Renesas RL78 Series User Manual page 608

RL78/G1D
(f) When arbitration loss occurs due to low-level data when attempting to generate a restart condition
(i) When WTIMn = 0
ST AD6 to AD0 R/W ACK
1: IICSn = 1000×110B
2: IICSn = 1000×000B (Sets the WTIMn bit to 1)
3: IICSn = 1000×100B (Clears the WTIMn bit to 0)
4: IICSn = 01000000B
5: IICSn = 00000001B
Remark : Always generated
: Generated only when SPIEn = 1
×: Don't care
(ii) When WTIMn = 1
ST AD6 to AD0 R/W ACK
1: IICSn = 1000×110B
2: IICSn = 1000×100B (Sets the STTn bit to 1)
3: IICSn = 01000100B
4: IICSn = 00000001B
Remark : Always generated
: Generated only when SPIEn = 1
×: Don't care
Remark n = 0
R01UH0515EJ0120 Rev.1.20
Dec 16, 2016
STTn = 1
↓
D7 to D0 ACK D7 to D0
1 2 3
STTn = 1
↓
D7 to D0 ACK D7 to D0
1 2
CHAPTER 14 SERIAL INTERFACE IICA
ACK D7 to D0 ACK
4
ACK D7 to D0 ACK
3
SP
5
SP
4
587