h8s-2635 Renesas Electronics Corporation., h8s-2635 Datasheet - Page 646

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

Section 15 I
15.3.8
The I
the slave address and the R/
of the last frame, and so on. Therefore, continuous data transfer using the DTC must be carried out
in conjunction with CPU processing by means of interrupts.
Table 15-5 shows some examples of processing using the DTC. These examples assume that the
number of transfer data bytes is known in slave mode.
Table 15-5 Examples of Operation Using the DTC
Rev. 6.00 Feb 22, 2005 page 586 of 1484
REJ09B0103-0600
Item
Slave address +
R/
transmission/
reception
Dummy data
read
Actual data
transmission/
reception
Dummy data
(H'FF) write
Last frame
processing
Transfer request
processing after
last frame
processing
Setting of
number of DTC
transfer data
frames
W
bit
2
C bus format provides for selection of the slave device and transfer direction by means of
Operation Using the DTC
2
C Bus Interface [Option] (Only for the H8S/2638, H8S/2639, and H8S/2630)
Master Transmit
Mode
Transmission by
DTC (ICDR write)
—
Transmission by
DTC (ICDR write)
—
Not necessary
1st time: Clearing
by CPU
2nd time: End
condition issuance
by CPU
Transmission:
Actual data count
+ 1 (+1 equivalent
to slave address +
R/
W
bits)
W
bit, confirmation of reception with the acknowledge bit, indication
Master Receive
Mode
Transmission by
CPU (ICDR write)
Processing by
CPU (ICDR read)
Reception by
DTC (ICDR read)
—
Reception by
CPU (ICDR read)
Not necessary
Reception: Actual
data count
Slave Transmit
Mode
Reception by
CPU (ICDR read)
—
Transmission by
DTC (ICDR write)
Processing by
DTC (ICDR write)
Not necessary
Automatic clearing
on detection of end
condition during
transmission of
dummy data (H'FF)
Transmission:
Actual data count
+ 1 (+1 equivalent
to dummy data
(H'FF))
Slave Receive
Mode
Reception by CPU
(ICDR read)
—
Reception by DTC
(ICDR read)
—
Reception by CPU
(ICDR read)
Not necessary
Reception: Actual
data count