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H8SX1663 数据表(PDF) 187 Page - Renesas Technology Corp

部件名 H8SX1663
功能描述  Renesas 32-Bit CISC Microcomputer H8SX Family / H8SX/1600 Series
PDF  1158 Pages
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制造商  RENESAS [Renesas Technology Corp]
网页  http://www.renesas.com
标志 RENESAS - Renesas Technology Corp

H8SX1663 数据表(HTML) 187 Page - Renesas Technology Corp

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Section 6 Bus Controller (BSC)
Rev.1.00 Jun. 07, 2006 Page 135 of 1102
REJ09B0294-0100
6.2.1
Bus Width Control Register (ABWCR)
ABWCR specifies the data bus width for each area in the external address space.
Bit
Bit Name
Initial Value
R/W
15
ABWH7
1
R/W
14
ABWH6
1
R/W
13
ABWH5
1
R/W
12
ABWH4
1
R/W
11
ABWH3
1
R/W
10
ABWH2
1
R/W
9
ABWH1
1
R/W
8
ABWH0
1/0
R/W
Bit
Bit Name
Initial Value
R/W
Note: * Initial value at 16-bit bus initiation is H'FEFF, and that at 8-bit bus initiation is H'FFFF.
7
ABWL7
1
R/W
6
ABWL6
1
R/W
5
ABWL5
1
R/W
4
ABWL4
1
R/W
3
ABWL3
1
R/W
2
ABWL2
1
R/W
1
ABWL1
1
R/W
0
ABWL0
1
R/W
Bit
Bit Name
Initial
Value*
1
R/W
Description
15
14
13
12
11
10
9
8
7
6
5
4
3
2
1
0
ABWH7
ABWH6
ABWH5
ABWH4
ABWH3
ABWH2
ABWH1
ABWL0
ABWL7
ABWL6
ABWL5
ABWL4
ABWL3
ABWL2
ABWL1
ABWL0
1
1
1
1
1
1
1
1/0
1
1
1
1
1
1
1
1
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
Area 7 to 0 Bus Width Control
These bits select whether the corresponding area is to be
designated as 8-bit access space or 16-bit access space.
ABWHn
ABWLn (n = 7 to 0)
×
0:
Setting prohibited
0
1:
Area n is designated as 16-bit
access space
1
1:
Area n is designated as 8-bit access
space*
2
[Legend]
×: Don't care
Notes: 1. Initial value at 16-bit bus initiation is H'FEFF, and that at 8-bit bus initiation is H'FFFF.
2. An address space specified as byte control SRAM interface must not be specified as 8-
bit access space.



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