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7721 датащи(PDF) 301 Page - Renesas Technology Corp

номер детали 7721
подробное описание детали  16-BIT SINGLE-CHIP MICROCOMPUTER
PDF  577 Pages
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производитель  RENESAS [Renesas Technology Corp]
домашняя страница  http://www.renesas.com
Logo RENESAS - Renesas Technology Corp

7721 датащи(HTML) 301 Page - Renesas Technology Corp

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7721 Group User’s Manual
13-22
DMA CONTROLLER
13.3 Control
q Priority level: Fixed priority
Bus request sampling
DMA0 request bit
DMA1 request bit
DMA2 request bit
DMA3 request bit
Channel priority level
: 0 > 1 > 2 > 3
DMA transfer execution
channel
12
0
1
3
(Nothing)
02
1
1
03
12
3
1
3
0
2
3
1
33
q Priority level: Rotating priority
Bus request sampling
DMA0 request bit
DMA1 request bit
DMA2 request bit
DMA3 request bit
Channel priority level
DMA transfer execution
channel
(Nothing)
The above timing diagram applies on the following conditions:
• No DRAM refresh request, no Hold request
• All of DMAi enable bits are “1.”
Fig. 13.3.1 Example of determining channel priority levels



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