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DMA Controller (DMAC)
Chapter 8
Preliminary User’s Manual U17566EE1V2UM00
Figure 8-6
shows DMAC transfers in single transfer mode in which a higher
priority DMA transfer request is generated. DMA channels 0 to 2 are used for a
block transfer and channel 3 is used for a single transfer.
Figure 8-6
Single transfer example 2
Note
The bus is always released
Figure 8-7
shows a DMA transfer example in single transfer mode in which a
lower priority DMA transfer request is generated within one clock after the end
of a single transfer. DMA channels 0 and 3 are used for the single transfer
example. When two DMA transfer request signals are activated at the same
time, the two DMA transfers are performed alternately.
Figure 8-7
Single transfer example 3
Note
The bus is always released
DMA Transfer
Request CH0
DMA1
DMA2
CPU
DMA2
CPU DMA3
CPU
CPU
CPU
DMA3
CPU
DMA0
DMA0
CPU
DMA1
CPU DMA3
Note
Note
Note
Note
DMA Transfer
Request CH1
DMA Transfer
Request CH2
DMA Transfer
Request CH3
DMA channel 0
terminal count
DMA channel 1
terminal count
DMA channel 2
terminal count
DMA channel 3
terminal count
DMA Transfer
Request CH0
DMA Transfer
Request CH3
DMA channel 0
terminal count
DMA channel 3
terminal count
CPU
CPU
DMA3
DMA0
CPU
DMA0
CPU
CPU
CPU
CPU
DMA0
CPU
DMA0
DMA3
CPU
CPU
DMA0
CPU
DMA0
Note
Note
Note
Note
Note
Note
Note
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