h8s-2138 Renesas Electronics Corporation., h8s-2138 Datasheet - Page 996

• Manufacturer Part Number: h8s-2138
• Description: Renesas 16-bit Single-chip Microcomputer H8s Family/h8s/2100 Series
• Manufacturer: Renesas Electronics Corporation.

Appendix B Internal I/O Registers
WSCR—Wait State Control Register
Rev. 4.00 Jun 06, 2006 page 942 of 1004
REJ09B0301-0400
Bit
Initial value
Read/Write
RAMS
Reserved
Note: Always write 0
R/W
7
0
when writing to
these bits in
the A-mask
version.
RAM0
R/W
Bus width control
6
0
0
1
External memory space designated as 16-bit access space
(illegal setting in the H8S/2138 and H8S/2134)
External memory space designated as 8-bit access space
ABW
R/W
5
1
Access state control
0
1
External memory space is designated as 2-state
access space
Wait state insertion in external memory space
accesses is disabled
External memory space is designated as 3-state
access space
Wait state insertion in external memory space
accesses is enabled
AST
R/W
4
1
Wait mode select 1 and 0
0
1
WMS1
R/W
H'FFC7
3
0
Wait count 1 and 0
0
1
0
1
0
1
WMS0
Program wait mode
Wait disabled mode
Pin wait mode
Pin auto-wait mode
R/W
2
0
0
1
0
1
No program wait
states are inserted
1 program wait state
is inserted in external
memory space
accesses
2 program wait states
are inserted in external
memory space
accesses
3 program wait states
are inserted in external
memory space
accesses
WC1
R/W
1
1
Bus Controller
WC0
R/W
0
1