HD6417706 RENESAS [Renesas Technology Corp], HD6417706 Datasheet - Page 305
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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9.4.3
When the DMAC receives simultaneous transfer requests on two or more channels, it selects a
channel according to a predetermined priority order. Two modes (fixed mode and round-robin
mode) are selected by the priority bits PR1 and PR0 in the DMA operation register (DMAOR).
Fixed Mode: In this mode, the priority levels among the channels remain fixed. There are three
kinds of fixed modes as follows:
These are selected by the PR1 and the PR0 bits in the DMA operation register (DMAOR).
Round-Robin Mode: Each time one word, byte, or longword, or 16-byte data is transferred on
one channel, the priority order is rotated. The channel on which the transfer was just finished
rotates to the bottom of the priority order. The round-robin mode operation is shown in figure 9.3.
The priority of the round-robin mode is CH0 > CH1 > CH2 > CH3 immediately after a reset.
CH0 > CH1 > CH2 > CH3
CH0 > CH2 > CH3 > CH1
CH2 > CH0 > CH1 > CH3
Channel Priority
Rev. 4.00, 03/04, page 259 of 660
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