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HD6432351 bảng dữ liệu(PDF) 251 Page - Renesas Technology Corp

tên linh kiện HD6432351
Giải thích chi tiết về linh kiện  16-Bit Single-Chip Microcomputer
PDF  1025 Pages
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nhà sản xuất  RENESAS [Renesas Technology Corp]
Trang chủ  http://www.renesas.com
Logo RENESAS - Renesas Technology Corp

HD6432351 bảng dữ liệu(HTML) 251 Page - Renesas Technology Corp

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Section 7 DMA Controller (DMAC)
Rev. 3.00 Sep 15, 2006 page 217 of 988
REJ09B0330-0300
(2) Block Transfer Mode
ETCRA:
Holds block size
Bit
ETCRAH
Initial value
R/W
:
:
:
:
*: Undefined
15
*
R/W
14
*
R/W
13
*
R/W
12
*
R/W
11
*
R/W
8
*
R/W
10
*
R/W
9
*
R/W
7
*
R/W
6
*
R/W
5
*
R/W
4
*
R/W
3
*
R/W
0
*
R/W
2
*
R/W
1
*
R/W
Block size counter
Bit
ETCRAL
Initial value
R/W
:
:
:
:
ETCRB:
0
*
R/W
2
*
R/W
1
*
R/W
3
*
R/W
4
*
R/W
5
*
R/W
6
*
R/W
7
*
R/W
8
*
R/W
9
*
R/W
10
*
R/W
11
*
R/W
12
*
R/W
13
*
R/W
14
*
R/W
15
*
R/W
Bit
ETCRB
Initial value
R/W
:
:
:
:
Block Transfer Counter
In block transfer mode, ETCRAL functions as an 8-bit block size counter and ETCRAH holds the
block size. ETCRAL is decremented each time a 1-byte or 1-word transfer is performed, and when
the count reaches H'00, ETCRAL is loaded with the value in ETCRAH. So by setting the block
size in ETCRAH and ETCRAL, it is possible to repeatedly transfer blocks consisting of any
desired number of bytes or words.
ETCRB functions in block transfer mode, as a 16-bit block transfer counter. ETCRB is
decremented by 1 each time a block is transferred, and transfer ends when the count reaches
H'0000.



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