Datasheet

Section 16 I
2
C Bus Interface (IIC) (Option)
Rev. 6.00 Mar. 18, 2010 Page 679 of 982
REJ09B0054-0600
Table 16.9 I
2
C Bus Timing (with Maximum Influence of t
Sr
/t
Sf
)
Time Indication (at Maximum Transfer Rate) [ns]
Item
t
cyc
Indication
t
Sr
/t
Sf
Influence
(Max)
I
2
C Bus
Specifi-
ation
(Min)
φ =
5 MHz
*
7
φ =
8 MHz
*
7
φ =
10 MHz
φ =
16 MHz
*
3
φ =
20 MHz
*
3
t
SCLHO
0.5t
SCLO
(–t
Sr
) Standard mode –1000 4000 4000 4000 4000 4000 4000
High-speed mode –300 600 950 950 950 950 950
t
SCLLO
0.5t
SCLO
(–t
Sf
) Standard mode –250 4700 4750 4750 4750 4750 4750
High-speed mode –250 1300 1000
*
1
1000
*
1
1000
*
1
1000
*
1
1000
*
1
t
BUFO
Standard mode –1000 4700 3800
*
1
3875
*
1
3900
*
1
3938
*
1
3950
*
1
0.5t
SCLO
–1t
cyc
( –t
Sr
)
High-speed mode –300 1300 750
*
1
825
*
1
850
*
1
888
*
1
900
*
1
t
STAHO
Standard mode –250 4000 4550 4625 4650 4688 4700
0.5t
SCLO
–1t
cyc
(–t
Sf
)
High-speed mode –250 600 800 875 900 938 950
t
STASO
1t
SCLO
(–t
Sr
) Standard mode –1000 4700 9000 9000 9000 9000 9000
High-speed mode –300 600 2200 2200 2200 2200 2200
t
STOSO
Standard mode –1000 4000 4400 4250 4200 4125 4100
0.5t
SCLO
+ 2t
cyc
(–t
Sr
)
High-speed mode –300 600 1350 1200 1150 1075 1050
Standard mode –1000 250 3100 3325 3400 3513 3550 t
SDASO
(master)
1t
SCLLO
*
2
–3t
cyc
(–t
Sr
)
High-speed mode –300 100 400 625 700 813 850
Standard mode –1000 250 3100 3325 3400 3513 3550 t
SDASO
(slave)
*
4
1t
SCLL
*
2
–3t
cyc
(–t
Sr
)
High-speed mode –300 100 400 625 700 813 850
Standard mode –1000 250 — — 2500 — — t
SDASO
(slave)
*
5
1t
SCLL
*
2
–12t
cyc
*
6
(–t
Sr
)
High-speed mode –300 100 — — –200
*
1
— —
t
SDAHO
3t
cyc
Standard mode 0 0 600 375 300 188 150
High-speed mode 0 0 600 375 300 188 150
Notes: 1. Does not meet the I
2
C bus interface specification. Remedial action such as the following
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 IICX bit and bits
CKS0 to CKS2.Depending on the frequency it may not be possible to achieve the
maximum transfer rate; therefore, whether or not the I
2
C bus interface specifications are
met must be determined in accordance with the actual setting conditions.
2. Calculated using the I
2
C bus specification values (standard mode: 4700 ns min; high-
speed mode: 1300 ns min).
3. Supported only by the H8S/2239 Group.
4. Not supported by the H8S/2258 Group.
5. Supported only by the H8S/2258 Group.