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H8S/2214 数据表(PDF) 253 Page - Renesas Technology Corp

部件名 H8S/2214
功能描述  16-Bit Single-Chip Microcomputer H8S Family/H8S/2200 Series
PDF  936 Pages
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制造商  RENESAS [Renesas Technology Corp]
网页  http://www.renesas.com
标志 RENESAS - Renesas Technology Corp

H8S/2214 数据表(HTML) 253 Page - Renesas Technology Corp

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Section 7 DMA Controller
Rev.4.00 Sep. 18, 2008 Page 193 of 872
REJ09B0189-0400
(2) Block Transfer Mode
ETCRA
Holds block size
Bit
:
15
14
13
12
11
10
9
8
ETCRAH
:
Initial value :
*
*
*
*
*
*
*
*
R/W
:
R/W
R/W
R/W
R/W
R/W
R/W
R/W
R/W
Block size counter
Bit
:
7
6
5
4
3
2
1
0
ETCRAL
:
Initial value :
*
*
*
*
*
*
*
*
R/W
:
R/W
R/W
R/W
R/W
R/W
R/W
R/W
R/W
*: Undefined
ETCRB
Block Transfer Counter
Bit
:
15
14
13
12
11
10
9
8
7
6
5
4
3
2
1
0
ETCRB
:
Initial value :
*
*
*
*
*
*
*
*
*
*
*
*
*
*
*
*
R/W
: R/W R/W R/W R/W R/W R/W R/W R/W R/W R/W R/W R/W R/W R/W R/W R/W
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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