HD6412373R RENESAS [Renesas Technology Corp], HD6412373R Datasheet - Page 511
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HD6412373R
Manufacturer Part Number
HD6412373R
Description
Renesas 16-Bit Single-Chip Microcomputer H8S Family/H8S/2300 Series
Manufacturer
RENESAS [Renesas Technology Corp]
Datasheet
1.HD6412373R.pdf
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9.5.4
Setting the CHNE bit 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 9.9 shows the operation of chain transfer. When activated, the DTC reads the register
information start address stored at the vector address, and then reads the first register information
at that start address. The CHNE bit in MRB is checked after the end of data transfer, if the value is
1, the next register information, which is located consecutively, is read and transfer is performed.
This operation is repeated until the end of data transfer of register information with CHNE = 0. It
is also possible, by setting both the CHNE bit and CHNS bit to 1, to specify execution of chain
transfer only when the transfer counter value is 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 9.9 Operation of Chain Transfer
Register information
Register information
CHNE=1
CHNE=0
Rev.7.00 Mar. 18, 2009 page 443 of 1136
Section 9 Data Transfer Controller (DTC)
REJ09B0109-0700
Destination
Destination
Source
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