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RL78/G1A CHAPTER 29 ELECTRICAL SPECIFICATIONS (T
A = −40 to +85°C)
R01UH0305EJ0200 Rev.2.00 892
Jul 04, 2013
Simplified I
2
C mode connection diagram (during communication at different potential)
SDAr
SCLr
SDA
SCL
User device
V
b
R
b
V
b
R
b
RL78
microcontroller
Simplified I
2
C mode serial transfer timing (during communication at different potential)
SDAr
t
LOW
tHIGH
tHD : DAT
SCLr
t
SU : DAT
1/fSCL
Remarks 1. Rb[Ω]: Communication line (SDAr, SCLr) pull-up resistance, Cb[F]: Communication line (SDAr, SCLr) load
capacitance, Vb[V]: Communication line voltage
2. r: IIC number (r = 00, 10, 20), g: PIM, POM number (g = 0, 1)
3. f
MCK: Serial array unit operation clock frequency
(Operation clock to be set by the CKSmn bit of serial mode register mn (SMRmn). m: Unit number,
n: Channel number (mn = 00, 02, 10)
4. IIC01, IIC11, and IIC21 cannot communicate at different potential. Use IIC00, IIC10, or IIC20 for
communication at different potential.