h8s-2628 Renesas Electronics Corporation., h8s-2628 Datasheet - Page 157
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h8s-2628
Manufacturer Part Number
h8s-2628
Description
Renesas 16-bit Single-chip Microcomputer H8s Family/h8s/2600 Series
Manufacturer
Renesas Electronics Corporation.
Datasheet
1.H8S-2628.pdf
(641 pages)
- Current page: 157 of 641
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8.5.4
Setting the CHNE bit in MRB to 1 enables a number of data transfers to be performed
consecutively in response to a single transfer request. SAR, DAR, CRA, CRB, MRA, and MRB,
which define data transfers, can be set independently.
Figure 8.8 shows the outline of the chain transfer operation.
When activated, the DTC reads the register information start address stored at the vector address
corresponding to the activation source, and then reads the first register information at that start
address. After data transfer ends, the CHNE bit will be tested. When it has been set to 1, DTC
reads the next register information located in a consecutive area and performs the data transfer.
These sequences are repeated until the CHNE bit is cleared to 0.
In the case of transfer with CHNE set to 1, an interrupt request to the CPU is not generated at the
end of the specified number of transfers or by setting of the DISEL bit to 1, and the interrupt
source flag for the activation source is not affected.
DTC vector
address
Chain Transfer
Register information
start address
Figure 8.8 Chain Transfer Operation
Register information
Register information
CHNE=1
CHNE=0
Section 8 Data Transfer Controller (DTC)
Rev. 3.00 Oct 04, 2005 page 117 of 598
REJ09B0155-0300
Destination
Destination
Source
Source
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