Rev.6.00 Oct.28.2004 page 182
of 1016
REJ09B0138-0600H
(1) Normal Mode
ETCRA
Transfer Counter
Bit
:
15
14
13
12
11
10
9
8
7
6
5
4
3
2
1
0
ETCR
:
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
*
: Undefined
In normal mode, ETCRA functions as a 16-bit transfer counter. ETCRA is decremented by 1 each time a transfer is
performed, and transfer ends when the count reaches H'0000. ETCRB is not used at this time.
ETCRB
ETCRB is not used in normal mode.
(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.
Содержание ZTAT H8S/2357F
Страница 4: ......
Страница 28: ...Rev 6 00 Oct 28 2004 page xxiv of xxiv REJ09B0138 0600H...
Страница 82: ...Rev 6 00 Oct 28 2004 page 54 of 1016 REJ09B0138 0600H...
Страница 108: ...Rev 6 00 Oct 28 2004 page 80 of 1016 REJ09B0138 0600H...
Страница 364: ...Rev 6 00 Oct 28 2004 page 336 of 1016 REJ09B0138 0600H...
Страница 438: ...Rev 6 00 Oct 28 2004 page 410 of 1016 REJ09B0138 0600H...
Страница 566: ...Rev 6 00 Oct 28 2004 page 538 of 1016 REJ09B0138 0600H...
Страница 588: ...Rev 6 00 Oct 28 2004 page 560 of 1016 REJ09B0138 0600H...
Страница 688: ...Rev 6 00 Oct 28 2004 page 660 of 1016 REJ09B0138 0600H...
Страница 694: ...Rev 6 00 Oct 28 2004 page 666 of 1016 REJ09B0138 0600H...
Страница 708: ...Rev 6 00 Oct 28 2004 page 680 of 1016 REJ09B0138 0600H...
Страница 1044: ...Rev 6 00 Oct 28 2004 page 1016 of 1016 REJ09B0138 0600H...
Страница 1047: ...H8S 2357 Group H8S 2357F ZTATTM H8S 2398F ZTATTM Hardware Manual 2 6 2 Ote machi Chiyoda ku Tokyo 100 0004 Japan...