HD6412350 Hitachi, HD6412350 Datasheet - Page 240
HD6412350
Manufacturer Part Number
HD6412350
Description
(HD6412350 / HD6432351) 16-BIT MICROCONTROLLER
Manufacturer
Hitachi
Datasheet
1.HD6412350.pdf
(989 pages)
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Bits 6 and 4—Data Transfer Enable (DTE): When DTE = 0, data transfer is disabled and the
activation source selected by the data transfer factor setting is ignored. If the activation source is
an internal interrupt, an interrupt request is issued to the CPU or DTC. If the DTIE bit is set to 1
when DTE = 0, the DMAC regards this as indicating the end of a transfer, and issues a transfer
end interrupt request to the CPU.
The conditions for the DTE bit being cleared to 0 are as follows:
When DTE = 1 and DTME = 1, data transfer is enabled and the DMAC waits for a request by the
activation source selected by the data transfer factor setting. When a request is issued by the
activation source, DMA transfer is executed.
The condition for the DTE bit being set to 1 is as follows:
Bit 6—Data Transfer Enable 1 (DTE1): Enables or disables data transfer on channel 1.
Bit 6
DTE1
0
1
Bit 4—Data Transfer Enable 0 (DTE0): Enables or disables data transfer on channel 0.
Bit 4
DTE0
0
1
Bits 3 and 1—Data Transfer Interrupt Enable B (DTIEB): These bits enable or disable an
interrupt to the CPU or DTC when transfer is interrupted. If the DTIEB bit is set to 1 when
DTME = 0, the DMAC regards this as indicating a break in the transfer, and issues a transfer
break interrupt request to the CPU or DTC.
A transfer break interrupt can be canceled either by clearing the DTIEB bit to 0 in the interrupt
handling routine, or by performing processing to continue transfer by setting the DTME bit to 1.
220
When initialization is performed
When the specified number of transfers have been completed
When 0 is written to the DTE bit to forcibly abort the transfer, or for a similar reason
When 1 is written to the DTE bit after the DTE bit is read as 0
Description
Data transfer disabled
Data transfer enabled
Description
Data transfer disabled
Data transfer enabled
(Initial value)
(Initial value)
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