HD6417144 RENESAS [Renesas Technology Corp], HD6417144 Datasheet - Page 573

• Manufacturer Part Number: HD6417144
• Description: 32-Bit RISC Microcomputer SuperHTM RISC engine Family/SH7144 Series
• Manufacturer: RENESAS [Renesas Technology Corp]

4. The SCL and SDA inputs are sampled in synchronization with Pφ. Therefore, the AC timing
5. The SCL rising time t
Table 14.9 Tolerance of the SCL Rise Time (t
6. The rise and fall times of SCL and SDA are respectively prescribed as being 1000 ns or less
IICX
0
1
depends on the period of Pφ cycle t
timing specifications of the I
The I
a bit-by-bit basis. When the rise time t
level) of SCL exceeds the time determined by the input clock of the I
level period of SCL is extended. The time SCL takes to rise is determined by the pull-up
resistance and the load capacitance. Therefore, to operate at the specified transfer rate, set the
pull-up resistance and load capacitance so that each time is within the corresponding value
given in table 14.9.
and 300 ns or less by the I
bus interface of this LSI are described by t
effect of the rise and fall times, the I
maximum transfer rate. Table 14.10 shows the results of calculating the output timing for each
available operating frequency, by considering the worst-case rise and fall times. t
satisfy the specifications of the I
countermeasures against this problem:
A. Ensure that your program provides the required interval (approximately 1 μs) between
B. Select a slave device with an input timing that permits use with this output timing for
issuing of the stop condition and of the next start condition.
connection to the I
t
7.5 t
17.5
t
2
pcyc
C bus interface monitors SCL in the master mode, and communication is synchronized in
pcyc
pcyc
Standard
mode
High-speed
mode
Standard
mode
High-speed
mode
Sr
2
C bus.
is defined as being within 1,000 ns (300 ns in the high-speed mode).
I
specification
(Max.)
1000
300
1000
300
2
C bus
2
C bus specification. The output timing of SCL and SDA for the I
2
C bus interface are not satisfied.
2
C bus interface specifications. Take either of the following
pcyc
2
C bus interface specifications may not be satisfied at the
. When the Pφ frequency does not reach 5 MHz, the AC
Sr
Pφ=
10MHz
750
←
←
←
(the time required to reach V
pcyc
as shown in table 14.8. However, due to the
Sr
)
Pφ=
16MHz
468
←
←
←
Rev.4.00 Mar. 27, 2008 Page 529 of 882
Time [ns]
Pφ=
20MHz
375
←
875
←
14. I
2
C Bus Interface (IIC) Option
Pφ=
25MHz
300
←
700
←
IH
2
C bus interface, the high-
from an initially low
REJ09B0108-0400
Pφ=
33MHz
227
227
530
←
BUFO
does not
Pφ=
40MHz
188
188
438
←
2
C