191
Chapter 7
DMA Functions (DMA Controller)
Preliminary User’s Manual U15839EE1V0UM00
Figure 7-24, “Line Transfer Example 3,” on page 191 and Figure 7-25, “Line Transfer Example 4,” on
page 191 shows DMAC transfers in line transfer mode in which a lower priority DMA transfer request is
generated within one clock after the end of a line transfer. When two DMA transfer requests are acti-
vated at the same time, the two DMA transfers are performed alternately.
DMA channel 0 and 3 in Figure 7-24, “Line Transfer Example 3,” on page 191 are used for the line
transfer example.
Figure 7-24:
Line Transfer Example 3
DMA channel 0 in Figure 7-25, “Line Transfer Example 4,” on page 191 is used for a single transfer and
channel 3 is used for the line transfer.
Figure 7-25:
Line Transfer Example 4
Note: The bus is always released
DMA Transfer
Request CH0
DMA channel 0
terminal count
DMA Transfer
Request CH3
DMA channel 3
terminal count
DMA3
CPU
DMA0
CPU
DMA0 DMA0 DMA0
DMA3
CPU
DMA3 DMA3
DMA0
Note
Note
DMA0 DMA0 CPU
DMA3 DMA3 DMA3
CPU
DMA3
Note
CPU
DMA0
DMA Transfer
Request CH0
DMA channel 0
terminal count
DMA Transfer
Request CH3
DMA channel 3
terminal count
DMA3
CPU
CPU
CPU
DMA0
CPU
DMA0
DMA3
CPU
DMA3 DMA3
DMA0
Note
Note
DMA3 DMA3 DMA3 DMA3
CPU
DMA0
CPU
CPU
CPU
Note
Note
Note
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