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8.1.4
Pin Configuration
Table 8-2 summarizes the DMAC pins.
In short address mode, external request transfer, single address transfer, and transfer end output
are not performed for channel A.
The DMA transfer acknowledge function is used in channel B single address mode in short
address mode.
When the DREQ pin is used, do not designate the corresponding port for output.
With regard to the DACK pins, setting single address transfer automatically sets the corresponding
port to output, functioning as a DACK pin.
With regard to the TEND pins, whether or not the corresponding port is used as a TEND pin can
be specified by means of a register setting.
Table 8-2
DMAC Pins
Channel
Pin Name
0
DMA request 0
DMA transfer acknowledge 0
DMA transfer end 0
1
DMA request 1
DMA transfer acknowledge 1
DMA transfer end 1
Symbol
I/O
DREQ0
Input
DACK0
Output
TEND0
Output
DREQ1
Input
DACK1
Output
TEND1
Output
Function
DMAC channel 0 external
request
DMAC channel 0 single address
transfer acknowledge
DMAC channel 0 transfer end
DMAC channel 1 external
request
DMAC channel 1 single address
transfer acknowledge
DMAC channel 1 transfer end
211
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