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RL78/G1A
CHAPTER 30 ELECTRICAL SPECIFICATIONS (G: INDUSTRIAL APPLICATIONS T
A
=
−
40 to +105
°
C)
R01UH0305EJ0200 Rev.2.00 943
Jul 04, 2013
30.5.2 Serial interface IICA
(1) I
2
C standard mode, fast mode
(TA = −40 to +105°C, 2.4 V ≤ EVDD0 ≤ VDD ≤ 3.6 V, VSS = EVSS0 = 0 V)
Standard
Mode
Fast Mode
Parameter Symbol Conditions
MIN. MAX. MIN. MAX.
Unit
Fast mode: fCLK ≥ 3.5 MHz 2.4 V ≤ EVDD0 ≤ 3.6 V 0 400 kHzSCLA0 clock frequency fSCL
Normal mode: f
CLK ≥ 1 MHz 2.4 V ≤ EVDD0 ≤ 3.6 V 0 100 kHz
Setup time of restart condition tSU:STA 4.7 0.6
μ
s
Hold time
Note 1
tHD:STA 4.0 0.6
μ
s
Hold time when SCLA0 = “L” tLOW 4.7 1.3
μ
s
Hold time when SCLA0 = “H” tHIGH 4.0 0.6
μ
s
Data setup time (reception) tSU:DAT 250 100 ns
Data hold time (transmission)
Note 2
tHD:DAT 0 3.45 0 0.9
μ
s
Setup time of stop condition tSU:STO 4.0 0.6
μ
s
Bus-free time tBUF 4.7 1.3
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 C
b (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: Cb = 320 pF, Rb = 1.1 kΩ
IICA serial transfer timing
t
LOW
t
HIGH
t
HD
:
STA
t
BUF
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