h8s-2635 Renesas Electronics Corporation., h8s-2635 Datasheet - Page 649

• Manufacturer Part Number: h8s-2635
• Description: Renesas 16-bit Single-chip Microcomputer H8s Family/h8s/2600 Series
• Manufacturer: Renesas Electronics Corporation.

15.4
Table 15-6 I
Item
SCL output cycle time
SCL output high pulse width
SCL output low pulse width
SDA output bus free time
Start condition output hold time
Retransmission start condition output
setup time
Stop condition output setup time
Data output setup time (master)
Data output setup time (slave)
Data output hold time
In master mode, if an instruction to generate a start condition is immediately followed by an
instruction to generate a stop condition, neither condition will be output correctly. To output
consecutive start and stop conditions, after issuing the instruction that generates the start
condition, read the relevant ports, check that SCL and SDA are both low, then issue the
instruction that generates the stop condition. Note that SCL may not yet have gone low when
BBSY is cleared to 0.
Either of the following two conditions will start the next transfer. Pay attention to these
conditions when reading or writing to ICDR.
Table 15-6 shows the timing of SCL and SDA output in synchronization with the internal
clock. Timings on the bus are determined by the rise and fall times of signals affected by the
bus load capacitance, series resistance, and parallel resistance.
Write access to ICDR when ICE = 1 and TRS = 1 (including automatic transfer from
ICDRT to ICDRS)
Read access to ICDR when ICE = 1 and TRS = 0 (including automatic transfer from
ICDRS to ICDRR)
Section 15 I
Usage Notes
2
C Bus Timing (SCL and SDA Output)
2
C Bus Interface [Option] (Only for the H8S/2638, H8S/2639, and H8S/2630)
Symbol
t
t
t
t
t
t
t
t
t
SCLO
SCLHO
SCLLO
BUFO
STAHO
STASO
STOSO
SDASO
SDAHO
Output Timing
28 t
0.5 t
0.5 t
0.5 t
0.5 t
1 t
0.5 t
1 t
1 t
3 t
Rev. 6.00 Feb 22, 2005 page 589 of 1484
SCLO
SCLLO
SCLL
cyc
cyc
SCLO
SCLO
SCLO
SCLO
SCLO
to 256 t
– 3 t
– 3 t
– 1 t
– 1 t
+ 2 t
cyc
cyc
cyc
cyc
cyc
cyc
Unit
ns
ns
ns
ns
ns
ns
ns
ns
ns
REJ09B0103-0600
Notes
Figure 24-28
(reference)