H8SX1653 Datasheet, PDF (365/1018 Pages) Renesas Technology Corp – Renesas 32-Bit CISC Microcomputer H8SX Family / H8SX/1600 Series

Section 8 Data Transfer Controller (DTC)
8.2.9 DTC Vector Base Register (DTCVBR)
DTCVBR is a 32-bit register that specifies the base address for vector table address calculation.
Bits 31 to 28 and bits 11 to 0 are fixed 0 and cannot be written to. The initial value of DTCVBR is
H'00000000.
Bit
31 30 29 28 27 26 25 24 23 22 21 20 19 18 17 16
Bit Name
Initial Value 0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
R/W
R
R
R
R R/W R/W R/W R/W R/W R/W R/W R/W R/W R/W R/W R/W
Bit
15 14 13 12 11 10
9
8
7
6
5
4
3
2
1
0
Bit Name
Initial Value 0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
R/W
R/W R/W R/W R/W R
R
R
R
R
R
R
R
R
R
R
R
8.3 Activation Sources
The DTC is activated by an interrupt request. The interrupt source is selected by DTCER. A DTC
activation source can be selected by setting the corresponding bit in DTCER; the CPU interrupt
source can be selected by clearing the corresponding bit in DTCER. At the end of a data transfer
(or the last consecutive transfer in the case of chain transfer), the activation source interrupt flag or
corresponding DTCER bit is cleared.
8.4 Location of Transfer Information and DTC Vector Table
Locate the transfer information in the data area. The start address of transfer information should be
located at the address that is a multiple of four (4n). Otherwise, the lower two bits are ignored
during access ([1:0] = B'00.) Transfer information can be located in either short address mode
(three longwords) or full address mode (four longwords). The DTCMD bit in SYSCR specifies
either short address mode (DTCMD = 1) or full address mode (DTCMD = 0). For details, see
section 3.2.2, System Control Register (SYSCR). Transfer information located in the data area is
shown in figure 8.2
The DTC reads the start address of transfer information from the vector table according to the
activation source, and then reads the transfer information from the start address. Figure 8.3 shows
correspondences between the DTC vector address and transfer information.
Rev.1.00 Sep. 08, 2005 Page 317 of 966
REJ09B0219-0100