Hitachi H8/3008 Hardware Manual page 552

ABWCR—Bus Width Control Register
Bit
Modes
Initial value
1 and 3
Modes Initial value
2 and 4 Read/Write
ASTCR—Access State Control Register
Bit
Initial value
Read/Write
536
7 6
ABW7 ABW6
1 1
0 0
R/W R/W
Area 7 to 0 bus width control
Bits 7 to 0
ABW7
to ABW0
0
1
7 6 5
AST7 AST6 AST5
1 1 1
R/W R/W R/W
Area 7 to 0 access state control
Bits 7 to 0
AST7
to AST0
0
1
H'EE020
5 4
ABW5 ABW4 ABW3
1 1
0 0
R/W R/W R/W
Bus Width of Access Area
Areas 7 to 0 are 16-bit access areas
Areas 7 to 0 are 8-bit access areas
H'EE021
4 3
AST4 AST3
1 1
R/W R/W
Number of States in Access Area
Areas 7 to 0 are two-state access areas
Areas 7 to 0 are three-state access areas
Bus controller
3 2 1
ABW2 ABW1
1 1 1
0 0 0
R/W R/W
Bus controller
2 1
AST2 AST1 AST0
1 1
R/W R/W
0
ABW0
1
0
R/W
0
1
R/W