r4f2426 Renesas Electronics Corporation., r4f2426 Datasheet - Page 499
r4f2426
Manufacturer Part Number
r4f2426
Description
16-bit Single-chip Microcomputer H8s Family / H8s/2400 Series
Manufacturer
Renesas Electronics Corporation.
Datasheet
1.R4F2426.pdf
(1302 pages)
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9.4
Locate the register information in the on-chip RAM (addresses: H'FFBC00 to H'FFBFFF).
Register information should be located at the address that is multiple of four within the range.
Locating the register information in address space is shown in figure 9.3. Locate the MRA, SAR,
MRB, DAR, CRA, and CRB registers, in that order, from the start address of the register
information. In the case of chain transfer, register information should be located in consecutive
areas as shown in figure 9.3 and the register information start address should be located at the
corresponding vector address to the activation source. Figure 9.4 shows correspondences between
the DTC vector address and register information. The DTC reads the start address of the register
information from the vector address set for each activation source, and then reads the register
information from that start address.
When the DTC is activated by software, the vector address is obtained from: H'0400 +
(DTVECR[7:0] × 2). For example, if DTVECR is H'10, the vector address is H'0420.
The configuration of the vector address is the same in both normal* and advanced modes, a 2-byte
unit being used in both cases. These two bytes specify the lower bits of the register information
start address.
Note: * Not available in this LSI.
Figure 9.3 Correspondence between DTC Vector Address and Register Information
Start address of
register information
Chain transfer
Location of Register Information and DTC Vector Table
MRA
MRA
MRB
MRB
0
CRA
CRA
Lower addresses
1
Four bytes
SAR
DAR
SAR
DAR
2
CRB
CRB
Rev. 1.00 Sep. 19, 2008 Page 471 of 1270
Section 9 Data Transfer Controller (DTC)
3
Register information
Register information
for second transfer
in case of chain
transfer
REJ09B0466-0100
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