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SH7721 bảng dữ liệu(PDF) 477 Page - Renesas Technology Corp

tên linh kiện SH7721
Giải thích chi tiết về linh kiện  Renesas 32-Bit RISC Microcomputer SuperHTM RISC engine Family / SH7700 Series
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nhà sản xuất  RENESAS [Renesas Technology Corp]
Trang chủ  http://www.renesas.com
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Section 10
Direct Memory Access Controller (DMAC)
Rev. 3.00 Jan. 18, 2008 Page 415 of 1458
REJ09B0033-0300
Bit
Bit Name
Initial
Value
R/W
Descriptions
Resource Select 3 to 0
Specify which transfer requests will be sent to the DMAC.
The changing of transfer request source should be done
in the state that the DMA enable bit (DE) is set to 0.
0
0
0
0
External request, dual address mode
0
0
0
1
Setting prohibited
0
0
1
0
External request, single address mode
External address space
→ External device with
DACK
0
0
1
1
External request, single address mode
External device with DACK
→ External address
space
0
1
0
0
Auto request
0
1
0
1
Setting prohibited
0
1
1
0
Setting prohibited
0
1
1
1
Setting prohibited
1
0
0
0
Selected by DMA extended resource selector
1
0
0
1
Setting prohibited
1
0
1
0
Setting prohibited
1
0
1
1
Setting prohibited
1
1
0
0
Setting prohibited
1
1
0
1
Setting prohibited
1
1
1
0
ADC
1
1
1
1
Setting prohibited
11
10
9
8
RS3
RS2
RS1
RS0
0
0
0
0
R/W
R/W
R/W
R/W
Note: External request specification is valid only in
CHCR_0 and CHCR_1. None of the external
request can be selected in CHCR_2 to CHCR_5.



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