RL78/G13 CHAPTER 29 ELECTRICAL SPECIFICATIONS
R01UH0146EJ0100 Rev.1.00 1030
Sep 22, 2011
Caution The pins mounted depend on the product. Refer to 2.1.1 20-pin products to 2.1.14 128-pin products,
and 2.1.15 Pins for each product (pins other than port pins).
Simplified I
2
C mode connection diagram (during communication at different potential)
User's device
SDAr
SCLr
SDA
SCL
V
b
R
b
V
b
R
b
RL78/G13
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
Caution Select the TTL input buffer and the N-ch open drain output (V
DD tolerance) mode for the SDAr pin and
the N-ch open drain output (V
DD tolerance) mode for the SCLr pin by using port input mode register g
(PIMg) and port output mode register g (POMg).
Remarks 1. R
b[Ω]:Communication line (SDAr, SCLr) pull-up resistance, Cb[F]: Communication line (SDAr, SCLr) load
capacitance, V
b[V]: Communication line voltage
2. r: IIC number (r = 00, 01, 10, 20, 30, 31), g: PIM, POM number (g = 0, 1, 4, 5, 8, 14)
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, 01, 02, 10, 12, 13)
4. V
IH and VIL below are observation points for the AC characteristics of the serial array unit when
communicating at different potentials in simplified I
2
C mode mode.
4.0 V ≤ EVDD0 ≤ 5.5 V, 2.7 V ≤ Vb ≤ 4.0 V: VIH = 2.2 V, VIL = 0.8 V
2.7 V ≤ EV
DD0 < 4.0 V, 2.3 V ≤ Vb ≤ 2.7 V: VIH = 2.0 V, VIL = 0.5 V
1.8 V ≤ EVDD0 < 3.3 V, 1.6 V ≤ Vb ≤ 2.0 V: VIH = 1.5 V, VIL = 0.32 V
<R>
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