h8s-2649 Renesas Electronics Corporation., h8s-2649 Datasheet - Page 187
h8s-2649
Manufacturer Part Number
h8s-2649
Description
Renesas 16-bit Single-chip Microcomputer H8s Family/h8s/2600 Series
Manufacturer
Renesas Electronics Corporation.
Datasheet
1.H8S-2649.pdf
(766 pages)
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8.5
Register information is stored in on-chip RAM. When activated, the DTC reads register
information in on-chip RAM and transfers data. After the data transfer, the DTC writes updated
register information back to the on-chip RAM.
The pre-storage of register information in the on-chip RAM makes it possible to transfer data over
any required number of channels. The transfer mode can be specified as normal, repeat, and block
transfer mode. Setting the CHNE bit in MRB to 1 makes it possible to perform a number of
transfers with a single activation source (chain transfer).
The 24-bit SAR designates the DTC transfer source address, and the 24-bit DAR designates the
transfer destination address. After each transfer, SAR and DAR are independently incremented,
decremented, or left fixed depending on its register information.
Operation
Read register information
Write register information
Clear an activation flag
Figure 8.4 Flowchart of DTC Operation
Transfer Counter=0
Read DTC vector
Data transfer
or DISEL=1
No
No
CHNE=1
Start
End
Yes
Yes
Next transfer
Interrupt exception
Clear DTCER
handling
Rev. 2.00 Dec. 05, 2005 Page 149 of 724
Section 8 Data Transfer Controller (DTC)
REJ09B0200-0200
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