HD6412373R RENESAS [Renesas Technology Corp], HD6412373R Datasheet - Page 211

• Manufacturer Part Number: HD6412373R
• Description: Renesas 16-Bit Single-Chip Microcomputer H8S Family/H8S/2300 Series
• Manufacturer: RENESAS [Renesas Technology Corp]

6.3.1
ABWCR designates each area in the external address space as either 8-bit access space or 16-bit
access space.
Bit
7
6
5
4
3
2
1
0
Note:
6.3.2
ASTCR designates each area in the external address space as either 2-state access space or 3-state
access space.
Bit
7
6
5
4
3
2
1
0
* In modes 2 and 4, ABWCR is initialized to 1. In modes 1 and 7, ABWCR is initialized
ABW7
ABW6
ABW5
ABW4
ABW3
ABW2
ABW1
ABW0
AST7
AST6
AST5
AST4
AST3
AST2
AST1
AST0
Bit Name
Bit Name
Bus Width Control Register (ABWCR)
Access State Control Register (ASTCR)
to 0.
Initial Value *
1/0
1/0
1/0
1/0
1/0
1/0
1/0
1/0
Initial Value
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
R/W
R/W
Description
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.
0: Area n is designated as 16-bit access space
1: Area n is designated as 8-bit access space
Description
Area 7 to 0 Access State Control
These bits select whether the corresponding
area is to be designated as 2-state access
space or 3-state access space. Wait state
insertion is enabled or disabled at the same
time.
0: Area n is designated as 2-state access space
1: Area n is designated as 3-state access space
Wait state insertion in area n access is
disabled
Wait state insertion in area n access is
enabled
Rev.7.00 Mar. 18, 2009 page 143 of 1136
Section 6 Bus Controller (BSC)
REJ09B0109-0700
(n = 7 to 0)
(n = 7 to 0)