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H8S2245 датащи(PDF) 177 Page - Renesas Technology Corp

номер детали H8S2245
подробное описание детали  Renesas 16-Bit Single-Chip Microcomputer H8S Family / H8S/2200 Series
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производитель  RENESAS [Renesas Technology Corp]
домашняя страница  http://www.renesas.com
Logo RENESAS - Renesas Technology Corp

H8S2245 датащи(HTML) 177 Page - Renesas Technology Corp

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Section 6 Bus Controller
Rev.3.00 Mar. 26, 2007 Page 135 of 772
REJ09B0355-0300
6.2
Register Descriptions
6.2.1
Bus Width Control Register (ABWCR)
7
ABW7
1
R/W
0
R/W
6
ABW6
1
R/W
0
R/W
5
ABW5
1
R/W
0
R/W
4
ABW4
1
R/W
0
R/W
3
ABW3
1
R/W
0
R/W
0
ABW0
1
R/W
0
R/W
2
ABW2
1
R/W
0
R/W
1
ABW1
1
R/W
0
R/W
Bit
Modes 1, 2, 3, 5, 6, 7
Initial value
R/W
Mode 4
Initial value
R/W
:
:
:
:
:
ABWCR is an 8-bit readable/writable register that designates each area for either 8-bit access or
16-bit access.
ABWCR sets the data bus width for the external memory space. The bus width for on-chip
memory and internal I/O registers is fixed regardless of the settings in ABWCR.
In normal mode, the settings of bits ABW7 to ABW1 have no effect on operation.
After a power-on reset and in hardware standby mode, ABWCR is initialized to H'FF in modes 1,
2, 3, and 5, 6, 7, and to H'00 in mode 4. It is not initialized by a manual reset or in software
standby mode.
Bits 7 to 0—Area 7 to 0 Bus Width Control (ABW7 to ABW0): These bits select whether the
corresponding area is to be designated for 8-bit access or 16-bit access. In normal mode, only part
of area 0 is enabled, and the ABW0 bit selects whether external space is to be designated for 8-bit
access or 16-bit access.
Bit n
ABWn
Description
0
Area n is designated for 16-bit access
1
Area n is designated for 8-bit access
Note:
n = 7 to 0



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