Datasheet

Section 7 Data Transfer Controller [H8S/2138 Group]

Rev. 4.00 Jun 06, 2006 page 173 of 1004

REJ09B0301-0400

7.3.3 DTC Vector Table

Figure 7.4 shows the correspondence between DTC vector addresses and register information.

Table 7.4 shows the correspondence between activation sources, vector addresses, and DTCER

bits. When the DTC is activated by software, the vector address is obtained from: H'0400 +

DTVECR[6:0] << 1 (where << 1 indicates a 1-bit left shift). For example, if DTVECR is H'10, the

vector address is H'0420.

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. The register

information can be placed at predetermined addresses in the on-chip RAM. The start address of

the register information should be an integral multiple of four.

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 address in the on-chip

RAM.

start address

Chain transfer

DTC vector

address

Figure 7.4 Correspondence between DTC Vector Address and Register Information