R0K572030S000BE Renesas Electronics America, R0K572030S000BE Datasheet - Page 462
R0K572030S000BE
Manufacturer Part Number
R0K572030S000BE
Description
KIT DEV FOR SH7203
Manufacturer
Renesas Electronics America
Series
Renesas Starter Kits (RSK)r
Type
MCUr
Specifications of R0K572030S000BE
Contents
CPU Board, LCD Module, E10A-Lite Emulator, Cable, QuickStart Guide and CD-ROM
Silicon Manufacturer
Renesas
Kit Contents
Board
Silicon Family Name
SH7203
Silicon Core Number
R5S72030W200FP
Tool / Board Applications
General Purpose MCU, MPU, DSP, DSC
Mcu Supported Families
SH7203
Lead Free Status / RoHS Status
Contains lead / RoHS non-compliant
For Use With/related Products
SH7203
Lead Free Status / Rohs Status
Compliant
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Section 10 Direct Memory Access Controller (DMAC)
Figure 10.4 shows how the priority order changes when channel 0 and channel 3 transfers are
requested simultaneously and a channel 1 transfer is requested during the channel 0 transfer. The
DMAC operates as follows:
1. Transfer requests are generated simultaneously to channels 0 and 3.
2. Channel 0 has a higher priority, so the channel 0 transfer begins first (channel 3 waits for
3. A channel 1 transfer request occurs during the channel 0 transfer (channels 1 and 3 are both
4. When the channel 0 transfer ends, channel 0 is given the lowest priority among the round-robin
5. At this point, channel 1 has a higher priority than channel 3, so the channel 1 transfer begins
6. When the channel 1 transfer ends, channel 1 is given the lowest priority among the round-robin
7. The channel 3 transfer begins.
8. When the channel 3 transfer ends, channels 3 and 2 are lowered in priority so that channel 3 is
Rev. 3.00 Sep. 28, 2009 Page 430 of 1650
REJ09B0313-0300
transfer).
waiting)
channels.
(channel 3 waits for transfer).
channels.
given the lowest priority among the round-robin channels.
Transfer request
(1) Channels 0 and 3
(3) Channel 1
Figure 10.4 Changes in Channel Priority in Round-Robin Mode
Waiting channel(s)
1, 3
3
3
None
(2) Channel 0 transfer start
(4) Channel 0 transfer ends
(5) Channel 1 transfer starts
(6) Channel 1 transfer ends
(7) Channel 3 transfer starts
(8) Channel 3 transfer ends
DMAC operation
Priority order
changes
Priority order
changes
Priority order
changes
Channel priority
0 > 1 > 2 > 3 > 4 > 5 > 6 > 7
1 > 2 > 3 > 0 > 4 > 5 > 6 > 7
2 > 3 > 0 > 1 > 4 > 5 > 6 > 7
0 > 1 > 2 > 3 > 4 > 5 > 6 > 7
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