HD6412350 Hitachi, HD6412350 Datasheet - Page 137
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HD6412350
Manufacturer Part Number
HD6412350
Description
(HD6412350 / HD6432351) 16-BIT MICROCONTROLLER
Manufacturer
Hitachi
Datasheet
1.HD6412350.pdf
(989 pages)
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5.6.3
Operation
The interrupt controller has three main functions in DTC and DMAC control.
(1) Selection of Interrupt Source: With the DMAC, the activation source is input directly to
each channel. The activation source for each DMAC channel is selected with bits DTF3 to DTF0
in DMACR. Whether the selected activation source is to be managed by the DMAC can be
selected with the DTA bit of DMABCR. When the DTA bit is set to 1, the interrupt source
constituting that DMAC activation source is not a DTC activation source or CPU interrupt source.
For interrupt sources other than interrupts managed by the DMAC, it is possible to select DTC
activation request or CPU interrupt request with the DTCE bit of DTCEA to DTCEF in the DTC.
After a DTC data transfer, the DTCE bit can be cleared to 0 and an interrupt request sent to the
CPU in accordance with the specification of the DISEL bit of MRB in the DTC.
When the DTC has performed the specified number of data transfers and the transfer counter value
is zero, the DTCE bit is cleared to 0 and an interrupt request is sent to the CPU after the DTC data
transfer.
(2) Determination of Priority: The DTC activation source is selected in accordance with the
default priority order, and is not affected by mask or priority levels. See section 7.6, Interrupts,
and section 8.3.3, DTC Vector Table, for the respective priorities.
With the DMAC, the activation source is input directly to each channel.
(3) Operation Order: If the same interrupt is selected as a DTC activation source and a CPU
interrupt source, the DTC data transfer is performed first, followed by CPU interrupt exception
handling.
If the same interrupt is selected as a DMAC activation source and a DTC activation source or CPU
interrupt source, operations are performed for them independently according to their respective
operating statuses and bus mastership priorities.
Table 5-11 summarizes interrupt source selection and interrupt source clearance control according
to the settings of the DTA bit of DMABCR in the DMAC, the DTCE bit of DTCEA to DTCEF in
the DTC and the DISEL bit of MRB in the DTC.
117
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