D12320VF25V Datasheet, PDF (1019/1146 Pages) Renesas Technology Corp – Old Company Name in Catalogs and Other Documents

ABWCR—Bus Width Control Register
Appendix B Internal I/O Registers
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
5
ABW6 ABW5
1
1
R/W R/W
0
0
R/W R/W
4
3
2
ABW4 ABW3 ABW2
1
1
1
R/W R/W R/W
0
0
0
R/W R/W R/W
1
0
ABW1 ABW0
1
1
R/W R/W
0
0
R/W 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
Note: * Modes 6 and 7 cannot be used in the ROMless versions.
(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.7.00 Feb. 14, 2007 page 985 of 1108
REJ09B0089-0700