Renesas Hitachi H8S/2194 Series Hardware Manual page 596

2
Table 25.7 I C Bus Timing (with Maximum Influence of t
t
cyc
Item Indication
t 0.5t
SCLHO SCLO
(-t )
Sr
t 0.5t
SCLLO SCLO
(-t )
Sf
t 0.5t -1t
BUFO SCLO cyc
(-t )
Sr
t 0.5t -1t
STAHO SCLO cyc
(-t )
Sf
t 1t
STASO SCLO
(-t )
Sr
t 0.5t +2t
STOSO SCLO
(-t )
Sr
3
t 1t * -3t
SDASO SCLLO
(master) (-t )
Sr
3
t 1t * -12t
SDASO SCLL cyc
(slave) (-t )
Sr
t 3t
SDAHO cyc
Notes: 1. Does not meet the I
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
are met must be determined in accordance with the actual setting conditions.
2. Value when the IICX bit is set to 1. When the IICX bit is cleared to 0, the value is (t
- 6t ).
cyc
3. Calculated using the I
speed mode: 1300 ns min.).
Time Indication (at Maximum Transfer Rate) [ns]
t /t
Sr Sf
Influence
(Max.)
Normal mode −1000
−300
High-speed
mode
Normal mode −250
−250
High-speed
mode
Normal mode −1000
−300
High-speed
mode
Normal mode −250
−250
High-speed
mode
Normal mode −1000
−300
High-speed
mode
Normal mode −1000
cyc
−300
High-speed
mode
Normal mode −1000
cyc
−300
High-speed
mode
Normal mode −1000
2
*
−300
High-speed
mode
Normal mode 0
High-speed 0
mode
2
C bus interface specification. Remedial action such as the
2
C bus specification values (standard mode: 4700 ns min.; high-
/t )
Sr Sf
2
I C Bus
Specification
φ = 5 MHz
(Min.)
4000 4000
600 950
4700 4750
*1
1300 1000
*1
4700 3800
*1
1300 750
4000 4550
600 800
4700 9000
600 2200
4000 4400
600 1350
250 3100
100 400
250 1300
−1400
*1
100
0 600
↑
0
2
C bus interface specifications
Rev. 2.0, 11/00, page 569 of 1037
φ = 8 MHz φ = 10 MHz
← ←
← ←
← ←
← ←
*1 *1
3875 3900
*1 *1
825 850
4625 4650
875 900
9000 9000
2200 2200
4250 4200
1200 1150
3325 3400
625 700
2200 2500
−500 −200
*1 *1
375 300
↑ ↑
SCLL