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HD6432351 bảng dữ liệu(PDF) 238 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) 238 Page - Renesas Technology Corp

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Section 7 DMA Controller (DMAC)
Rev. 3.00 Sep 15, 2006 page 204 of 988
REJ09B0330-0300
(2) Repeat Mode
Transfer Number Storage
Bit
ETCRH
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
Transfer Counter
Bit
ETCRL
Initial value
R/W
:
:
:
:
In repeat mode, ETCR functions as transfer counter ETCRL (with a count range of 1 to 256) and
transfer number storage register ETCRH. ETCRL is decremented by 1 each time a transfer is
performed, and when the count reaches H'00, ETCRL is loaded with the value in ETCRH. At this
point, MAR is automatically restored to the value it had when the count was started. The DTE bit
in DMABCR is not cleared, and so transfers can be performed repeatedly until the DTE bit is
cleared by the user.
ETCR is not initialized by a reset or in standby mode.



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