R0K572011S000BE Renesas Electronics America, R0K572011S000BE Datasheet - Page 385
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R0K572011S000BE
Manufacturer Part Number
R0K572011S000BE
Description
KIT STARTER FOR SH7201
Manufacturer
Renesas Electronics America
Series
Renesas Starter Kits (RSK)r
Type
MCUr
Datasheets
1.R0K572011S000BE.pdf
(1222 pages)
2.R0K572011S000BE.pdf
(7 pages)
3.R0K572011S000BE.pdf
(5 pages)
Specifications of R0K572011S000BE
Contents
CPU Board, LCD Display Module, E8 Emulator, Cable, QuickStart Guide and CD-ROM
For Use With/related Products
SH7201
Lead Free Status / RoHS Status
Contains lead / RoHS non-compliant
- Current page: 385 of 1222
- Download datasheet (8Mb)
SH7201 Group
11.8
11.8.1
Channel priority is allocated in descending order from channel 0; that is priority follows the below
relation, where P indicates priority.
P
11.8.2
The DMAC determines the priority every time single operand transfer is performed.
When a DMA request with a higher priority is generated during transfer for one channel, the
transfer for the higher-priority channel only starts after the end of the current operand transfer.
Figure 11.10 shows overall operation when multiple DMA requests are generated. The thick lines
in the figure indicate the periods over which the DMA request signals are at the low level. Here
channels 0, 2 and 3 are set to a level sense and channel 1 is set to an edge sense.
1. Since the channel 2 request is masked, it is regarded as non-existent. Thus, transfer on channel
2. Since channel 0 has the highest priority, transfer on this channel starts up.
3. Since channel 2 has the higher priority of the requests at this point, transfer on this channel
4. Transfer on channel 3 is restarted as there are no other requests at this point.
5. When the DMA requests are simultaneously generated for channels 0, 1, and 3, transfer on
6. After the transfer on channel 0 is complete, transfer on channel 1 starts up because it has the
7. A further DMA request (the selected edge) is received on channel 1 while DMA transfer is in
8. On completion of the transfer on channel 1, transfer on channel 3 starts up since there are no
9. No transfer starts up immediately after the end of the unit transfer operation on channel, since
R01UH0026EJ0300 Rev. 3.00
Sep 24, 2010
channel 0
3 starts up.
restarts.
channel 0 starts up because it has the highest priority.
second highest priority.
progress. Transfer on channel 1 is thus restarted after completion of the current round of
transfer on channel 1. No masking period applies in the case of edge sensing.
other requests.
channel 3 requests are masked and there are no other requests. Transfer on channel 3 only
restarts after the end of the masking period.
> P
Determining DMA Channel Priority
Channel Priority Order
Operation during Multiple DMA Requests
channel 1
> P
channel 3
… P
channel 6
> P
channel 7
. This order is fixed.
Section 11 Direct Memory Access Controller (DMAC)
Page 357 of 1190
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