188
Chapter 7
DMA Functions (DMA Controller)
Preliminary User’s Manual U15839EE1V0UM00
Figure 7-18, “Single Transfer Example 3,” on page 188 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 sin-
gle 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 7-18:
Single Transfer Example 3
Figure 7-19, “Single Transfer Example 4,” on page 188 shows a single transfer mode example in which
two or more lower priority DMA transfer requests are generated within one clock after the end of a sin-
gle transfer. DMA channels 0, 2 and 3 are used for this single transfer example. When three or more
DMA transfer request signals are activated at the same time always the two highest priority DMA trans-
fers are performed alternately.
Figure 7-19:
Single Transfer Example 4
Note: The bus is always released
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
DMA2 CPU
DMA3
CPU
CPU
DMA3 CPU
CPU
DMA2
DMA0
CPU
DMA0
Note
Note
Note
Note
Note
DMA2 CPU
Note
DMA3
CPU
DMA2 CPU
CPU
DMA3
Note
CPU
CPU
Note
Note
DMA Transfer
Request CH0
DMA Transfer
Request CH2
DMA Transfer
Request CH3
DMA channel 0
terminal count
DMA channel 2
terminal count
DMA channel 3
terminal count
Содержание mPD703128
Страница 6: ...6 Preliminary User s Manual U15839EE1V0UM00 ...
Страница 20: ...20 Preliminary User s Manual U15839EE1V0UM00 ...
Страница 32: ...32 Preliminary User s Manual U15839EE1V0UM00 MEMO ...
Страница 154: ...154 Preliminary User s Manual U15839EE1V0UM00 MEMO ...
Страница 238: ...238 Preliminary User s Manual U15839EE1V0UM00 MEMO ...
Страница 356: ...356 Preliminary User s Manual U15839EE1V0UM00 MEMO ...
Страница 522: ...522 Preliminary User s Manual U15839EE1V0UM00 MEMO ...
Страница 600: ...600 Preliminary User s Manual U15839EE1V0UM00 MEMO ...
Страница 610: ...610 Preliminary User s Manual U15839EE1V0UM00 ...
Страница 612: ......