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8.4.3
Channel Priority
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 bits PR1 and PR0 in the DMA operation register (DMAOR).
Fixed Mode: In these modes, the priority levels among the channels remain fixed. There are two
kinds of fixed modes as follows:
CH0 > CH1 > CH2 > CH3
CH0 > CH2 > CH3 > CH1
These are selected by the PR1 and the PR0 bits in the DMA operation register (DMAOR).
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