HD64F2638F20J Datasheet, PDF (1407/1512 Pages) Renesas Technology Corp – Renesas 16-Bit Single-Chip Microcomputer H8S Family/H8S/2600 Series

H8S/2639, H8S/2638, H8S/2636,
H8S/2630, H8S/2635 Group
Appendix B Internal I/O Register
ABWCR—Bus Width Control Register
H'FED0
Bus Controller
Bit
Modes 5 to 7
Initial value
Read/Write
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
Bit
Initial value
Read/Write
7
AST7
1
R/W
6
AST6
1
R/W
5
AST5
1
R/W
H'FED1
4
AST4
1
R/W
3
AST3
1
R/W
2
AST2
1
R/W
Bus Controller
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)
REJ09B0103-0800 Rev. 8.00
May 28, 2010
Page 1357 of 1458