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9
(4) Address count direction and address changes
The direction in which the source and destination addresses are counted as transfer proceeds
("Address fixed" or "Address incremental") is set for each channel using the SADSL (source
address direction select) and DADSL (destination address select) bits.
When the transfer size is 16 bits, the address is incremented by two for each DMA transfer
performed; when the transfer size is 8 bits, the address is incremented by one.
Table 9.3.11 Address Count Direction and Address Changes
Address Count Direction
Address fixed
Address incremental
(5) Transfer count value
The transfer count value is decremented by one at a time irrespective of the size of transfer unit
(8 or 16 bits).
9.3 Functional Description of the DMAC
Transfer Unit
8 bits
16 bits
8 bits
16 bits
9-34
Address Change for One DMA
0
0
+1
+2
DMAC
Ver.0.10
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