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2
Section 18 I
C Bus Interface (IIC)
2
Table 18.13 I
C Bus Timing (with Maximum Influence of t
t
cyc
Indication
Item
t
0.5 t
(–t
)
SCLHO
SCLO
Sr
t
0.5 t
(–t
)
SCLLO
SCLO
Sf
t
0.5 t
–1 t
BUFO
SCLO
cyc
( –t
)
Sr
t
0.5 t
–1 t
STAHO
SCLO
cyc
(–t
)
Sf
t
1 t
(–t
)
STASO
SCLO
Sr
t
0.5 t
+ 2 t
STOSO
SCLO
cyc
(–t
)
Sr
3
t
1 t
*
–3 t
SDASO
SCLLO
cyc
(master)
(–t
)
Sr
3
t
1 t
*
–12
SDASO
SCLL
2
(slave)
t
*
cyc
(–t
)
Sr
t
3 t
SDAHO
cyc
Notes: 1. Does not meet the I
is necessary: (a) secure a start/stop condition issuance interval; (b) adjust the rise and
fall times by means of a pull-up resistor and capacitive load; (c) reduce the transfer rate;
(d) select slave devices whose input timing permits this output timing.
The values in the above table will vary depending on the settings of the bits TCSS,
IICX3 to IICX0 and CKS2 to CKS0. Depending on the frequency it may not be possible
to achieve the maximum transfer rate; therefore, whether or not the I
specifications are met must be determined in accordance with the actual setting
conditions.
Rev. 1.00 Mar. 12, 2008 Page 654 of 1178
REJ09B0403-0100
Time Indication (at Maximum Transfer Rate) [ns]
t
Sr
Influence
(Max.)
Standard mode
High-speed mode
Standard mode
–1000
High-speed mode
–300
Standard mode
–250
High-speed mode
–250
Standard mode
–1000
High-speed mode
–300
Standard mode
–250
High-speed mode
–250
Standard mode
–1000
High-speed mode
–300
Standard mode
–1000
High-speed mode
–300
Standard mode
–1000
High-speed mode
–300
Standard mode
–1000
High-speed mode
–300
Standard mode
0
High-speed mode
0
2
C bus interface specification. Remedial action such as the following
Sr
2
/t
I
C Bus
Sf
Specifi-
cation (Min.)
4000
600
4700
1300
4700
1300
4000
600
4700
600
4000
600
250
100
250
100
0
0
/t
)
Sf
φ = 20 MHz
φ = 25 MHz
φ/200
φ/224
φ/48
φ/56
4000
3480
900
820
4750
4230
950*
870*
3950*
3440*
850*
780*
4700
4190
900
830
9000
7960
2100
1940
4100
3560
1000
900
3600
3110
500
450
3100
3220
400
520
150
120
150
120
2
C bus interface
φ = 34 MHz
φ/224
φ/80
3706
876
4456
926*
3676*
847*
4426
897
8412
2053
3765
935
3368
538
3347
64
88
88
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