HD6412332 RENESAS [Renesas Technology Corp], HD6412332 Datasheet - Page 339
HD6412332
Manufacturer Part Number
HD6412332
Description
Renesas 16-Bit Single-Chip Microcomputer H8S Family/H8S/2300 Series
Manufacturer
RENESAS [Renesas Technology Corp]
Datasheet
1.HD6412332.pdf
(1244 pages)
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8.3.2
The DTC operates when activated by an interrupt or by a write to DTVECR by software. An
interrupt request can be directed to the CPU or DTC, as designated by the corresponding DTCER
bit. An interrupt becomes a DTC activation source when the corresponding bit is set to 1, and a
CPU interrupt source when the bit is cleared to 0.
At the end of a data transfer (or the last consecutive transfer in the case of chain transfer), the
activation source or corresponding DTCER bit is cleared. Table 8.4 shows activation source and
DTCER clearance. The activation source flag, in the case of RXI0, for example, is the RDRF flag
of SCI0.
Table 8.4
Activation Source
Software activation The SWDTE bit is cleared to 0
Interrupt activation
Figure 8.3 shows a block diagram of activation source control. For details see section 5, Interrupt
Controller.
Activation Sources
Activation Source and DTCER Clearance
When the DISEL Bit Is 0 and
the Specified Number of
Transfers Have Not Ended
•
•
The corresponding DTCER
bit remains set to 1
The activation source flag is
cleared to 0
Rev.4.00 Sep. 07, 2007 Page 309 of 1210
When the DISEL Bit Is 1, or when
the Specified Number of Transfers
Have Ended
•
•
•
•
•
The SWDTE bit remains set to 1
An interrupt is issued to the CPU
The corresponding DTCER bit is
cleared to 0
The activation source flag remains set
to 1
A request is issued to the CPU for the
activation source interrupt
REJ09B0245-0400
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