Datasheet

RL78/G12 3. ELECTRICAL SPECIFICATIONS (G: T
A = −40 to +105°C)
R01DS0193EJ0200 Rev.2.00
Sep 06, 2013
Page 93 of 106
Simplified I
2
C mode connection diagram (during communication at different potential)
SDAr
SCLr
SDA
SCL
User's device
V
b
Rb
Vb
Rb
RL78
microcontroller
Simplified I
2
C mode serial transfer timing (during communication at different potential)
SDAr
t
LOW
t HIGH
t HD : DAT
SCLr
t
SU : DAT
1/f SCL
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, 20)
3. f
MCK: Serial array unit operation clock frequency
(Operation clock to be set by the serial clock select register m (SPSm) and the CKSmn bit of serial mode
register mn (SMRmn).
m: Unit number (m = 0,1), n: Channel number (n = 0))