H8S2245 datasheet(233/818 Pages) RENESAS

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Section 7 Data Transfer Controller

Rev.3.00 Mar. 26, 2007 Page 191 of 772

REJ09B0355-0300

When an interrupt has been designated a DTC activation source, existing CPU mask level and

interrupt controller priorities have no effect. If there is more than one activation source at the same

time, the DTC operates in accordance with the default priorities.

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.

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