HD6412340 HITACHI [Hitachi Semiconductor], HD6412340 Datasheet - Page 204

• Manufacturer Part Number: HD6412340
• Description: H8S/2345 F-ZTAT Hardware Manual
• Manufacturer: HITACHI [Hitachi Semiconductor]

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, 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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