HD6417706 RENESAS [Renesas Technology Corp], HD6417706 Datasheet - Page 301
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HD6417706
Manufacturer Part Number
HD6417706
Description
Renesas 32-Bit RISC Microcomputer Super RISC engine Family/SH7700 Series
Manufacturer
RENESAS [Renesas Technology Corp]
Datasheet
1.HD6417706.pdf
(709 pages)
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9.4
When there is a DMA transfer request, the DMAC starts the transfer according to the
predetermined channel priority order; when the transfer end conditions are satisfied, it ends the
transfer. Transfers can be requested in three modes: auto request, external request, and on-chip
peripheral module request. The dual address mode has direct address transfer mode and indirect
address transfer mode. In the bus mode, the burst mode or the cycle steal mode can be selected.
9.4.1
After the DMA source address registers (SAR_0 to SAR_3), DMA destination address registers
(DAR_0 to DAR_3), DMA transfer count registers (DMATCR_0 to DMATCR_3), DMA channel
control registers (CHCR_0 to CHCR_3), and DMA operation register (DMAOR) are set, the
DMAC transfers data according to the following procedure:
1. Checks to see if transfer is enabled (DE = 1, DME = 1, TE = 0, AE = 0, NMIF = 0)
2. When a transfer request comes and transfer is enabled, the DMAC transfers 1 transfer unit of
3. When the specified number of transfer have been completed (when DMATCR reaches 0), the
4. When an NMI interrupt is generated or an address error occurs during DMA transfer, the
Figure 9.2 is a flowchart of this procedure.
data (depending on the TS0 and TS1 settings). For an auto request, the transfer begins
automatically when the DE bit and DME bit are set to 1. The DMATCR value will be
decremented for each transfer. The actual transfer flows vary by address mode and bus mode.
transfer ends normally. If the IE bit of the CHCR is set to 1 at this time, a DEI interrupt is sent
to the CPU.
transfers are suspended. Transfers are also suspended when the DE bit of the CHCR or the
DME bit of the DMAOR are changed to 0.
Operation
DMA Transfer Flow
Rev. 4.00, 03/04, page 255 of 660
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