7721 Datasheet, PDF (353/577 Pages) List of Unclassifed Manufacturers – H Bridge Power Module

DMA CONTROLLER
13.7 Array chain transfer mode
From preceding “Figure 13.7.4”
Selection of priority level and TC pin, and setting DMAi request bit to “0”
b7
00 00
b0
DMAC control register L (Address 6816)
Priority select bit
0 : Fixed
1 : Rotating
TC pin validity bit
0 : Invalid
(P103 pin functions as a programmable I/O port.)
1 : Valid
(P103 pin functions as TC pin.)
DMA0 request bit
DMA1 request bit
DMA2 request bit
DMA3 request bit
0 : No request
b7
b0
DMAC control register H (Address 6916)
Software DMAi request bit
(Valid in software DMA source selected)
Bit 0 : Channel 0
Bit 1 : Channel 1
Bit 2 : Channel 2
Bit 3 : Channel 3
DMA0 enable bit
DMA1 enable bit
DMA2 enable bit
DMA3 enable bit
0 : Disabled
1 : Enabled
When selecting external
DMA source
Inputting DMA request
b7
signal to DMAREQi pin
When selecting internal
DMA source
When selecting internal DMA
source except software
When selecting software
DMA request
b0
DMAC control register H (Address 6916)
Interrupt request of
each peripheral
function occurs
Software DMA0 request bit
Software DMA1 request bit
Software DMA2 request bit
Software DMA3 request bit
0 : No request
1 : Requested
When writing “1,” DMA request is generated.
DMA transfer starts
Fig. 13.7.5 Initial setting example for registers relevant to array chain transfer mode (3)
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7721 Group User’s Manual