D12320VF25IV Datasheet, PDF (1136/1304 Pages) Renesas Technology Corp – Old Company Name in Catalogs and Other Documents

Appendix B Internal I/O Registers
ABWCR—Bus Width Control Register
H'FED0
Bus Controller
Bit
:
Modes 5 to 7
Initial value :
R/W
:
Mode 4
Initial value :
Read/Write :
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
2
ABW2
1
R/W
0
R/W
1
ABW1
1
R/W
0
R/W
0
ABW0
1
R/W
0
R/W
Area 7 to 0 Bus Width Control
0 Area n is designated for 16-bit access
1 Area n is designated for 8-bit access
(n = 7 to 0)
ASTCR—Access State Control Register
H'FED1
Bus Controller
Bit
:
Initial value :
Read/Write :
7
AST7
1
R/W
6
AST6
1
R/W
5
AST5
1
R/W
4
AST4
1
R/W
3
AST3
1
R/W
2
AST2
1
R/W
1
AST1
1
R/W
0
AST0
1
R/W
Area 7 to 0 Access State Control
0 Area n is designated for 2-state access
Wait state insertion in area n external space is disabled
1 Area n is designated for 3-state access
Wait state insertion in area n external space is enabled
(n = 7 to 0)
Rev.6.00 Sep. 27, 2007 Page 1104 of 1268
REJ09B0220-0600