p2125vps20 Renesas Electronics Corporation., p2125vps20 Datasheet - Page 172

• Manufacturer Part Number: p2125vps20
• Description: 16-bit Single-chip Microcomputer H8s Family / H8s/2100 Series
• Manufacturer: Renesas Electronics Corporation.

Section 7 Data Transfer Controller (DTC)
7.4
Locate the register information in the on-chip RAM (addresses: H'(FF)EC00 to H'(FF)EFFF).
Register information should be located at an address that is a multiple of four within the range.
The method for locating the register information in address space is shown in figure 7.3. Locate
MRA, SAR, MRB, DAR, CRA, and CRB, 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 7.3, and the register information start address should be located at the
vector address corresponding to the interrupt source in the DTC vector table. The DTC reads the
start address of the register information from the vector table 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[6:0] × 2). For example, if DTVECR is H'10, the vector address is H'0420.
The configuration of the vector address is a 2-byte unit. Specify the lower two bytes of the register
information start address.
Rev. 1.00 Sep. 21, 2006 Page 134 of 658
REJ09B0310-0100
Register
information
start address
Chain
transfer
Location of Register Information and DTC Vector Table
Figure 7.3 DTC Register Information Location in Address Space
MRA
MRB
MRA
MRB
B'00
CRA
CRA
B'01
Lower address
4 bytes
B'10
SAR
DAR
SAR
DAR
CRB
CRB
B'11
Register information
Register information
for 2nd transfer in
chain transfer