RL78/G13 CHAPTER 29 ELECTRICAL SPECIFICATIONS
R01UH0146EJ0100 Rev.1.00 1031
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).
29.6.2 Serial interface IICA
(T
A = −40 to +85°C, 1.6 V ≤ EVDD0 = EVDD1 ≤ VDD ≤ 5.5 V, VSS = EVSS0 = EVSS1 = 0 V)
Standard
Mode
Fast Mode
Fast Mode
Plus
Parameter Symbol Conditions
MIN. MAX. MIN. MAX. MIN. MAX.
Unit
Fast mode plus:
f
CLK ≥ 10 MHz
2.7 V ≤ EV
DD0 ≤ 5.5 V 0 1000 kHz
Fast mode:
f
CLK ≥ 3.5 MHz
1.8 V ≤ EV
DD0 ≤ 5.5 V 0 400 kHz
SCLA0 clock frequency fSCL
Normal mode:
f
CLK ≥ 1 MHz
1.6 V ≤ EV
DD0 ≤ 5.5 V 0 100 kHz
Setup time of restart condition tSU:STA 4.7 0.6 0.26
μ
s
Hold time
Note 1
tHD:STA 4.0 0.6 0.26
μ
s
Hold time when SCLA0 = “L” tLOW 4.7 1.3 0.5
μ
s
Hold time when SCLA0 = “H” tHIGH 4.0 0.6 0.26
μ
s
Data setup time (reception) tSU:DAT 250 100 50 ns
Data hold time (transmission)
Note 2
tHD:DAT 0 3.45 0 0.9 0
μ
s
Setup time of stop condition tSU:STO 4.0 0.6 0.26
μ
s
Bus-free time tBUF 4.7 1.3 0.5
μ
s
Notes 1. The first clock pulse is generated after this period when the start/restart condition is detected.
2. The maximum value (MAX.) of t
HD:DAT is during normal transfer and a wait state is inserted in the ACK
(acknowledge) timing.
Remark The maximum value of Cb (communication line capacitance) and the value of Rb (communication line pull-up
resistor) at that time in each mode are as follows.
Standard mode: C
b = 400 pF, Rb = 2.7 kΩ
Fast mode: C
b = 320 pF, Rb = 1.1 kΩ
Fast mode plus: C
b = 120 pF, Rb = 1.1 kΩ
IICA serial transfer timing
t
LOW
t
LOW
t
HIGH
t
HD:STA
Stop
condition
Start
condition
Restart
condition
Stop
condition
t
SU:DAT
t
SU:STA
t
SU:STO
t
HD:STA
t
HD:DAT
SCL0
SDA0
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