HD6432621 Hitachi, HD6432621 Datasheet - Page 967

• Manufacturer Part Number: HD6432621
• Description: (HD64F262x Series) 16-Bit Microcomputer
• Manufacturer: Hitachi

ABWCR—Bus Width Control Register
ASTCR—Access State Control Register
Bit
Modes 5 to 7
Initial value
Read/Write
Mode 4
Initial value
Read/Write
Bit
Initial value
Read/Write
:
:
:
:
:
:
:
:
ABW7
AST7
R/W
R/W
R/W
7
1
7
1
0
ABW6
AST6
Area 7 to 0 access state control
R/W
R/W
R/W
0 Area n is designated for 2-state access
1
6
1
0
6
1
Wait state insertion in area n external space access is disabled
Area n is designated for 3-state access
Wait state insertion in area n external space access is enabled
ABW5
AST5
R/W
R/W
R/W
5
1
5
1
0
ABW4
AST4
R/W
R/W
R/W
4
1
4
1
0
Area 7 to 0 bus width control
0 Area n is designated for 16-bit access
1
H'FED0
H'FED1
Area n is designated for 8-bit access
ABW3
AST3
R/W
R/W
R/W
3
1
0
3
1
ABW2
AST2
R/W
R/W
R/W
2
1
2
1
0
ABW1
AST1
R/W
R/W
R/W
1
1
1
1
0
Bus Controller
Bus Controller
(n = 7 to 0)
(n = 7 to 0)
ABW0
AST0
R/W
R/W
R/W
0
1
0
0
1
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