Datasheet

Appendix B Internal I/O Registers
Rev. 4.00 Jun 06, 2006 page 942 of 1004
REJ09B0301-0400
WSCR—Wait State Control Register H'FFC7 Bus Controller
7
RAMS
0
R/W
6
RAM0
0
R/W
5
ABW
1
R/W
4
AST
1
R/W
3
WMS1
0
R/W
0
WC0
1
R/W
2
WMS0
0
R/W
1
WC1
1
R/W
Bit
Initial value
Read/Write
Reserved
Note: Always write 0
when writing to
these bits in
the A-mask
version.
Wait count 1 and 0
0 No program wait
states are inserted
0
1 program wait state
is inserted in external
memory space
accesses
1
1 2 program wait states
are inserted in external
memory space
accesses
0
3 program wait states
are inserted in external
memory space
accesses
1
Wait mode select 1 and 0
0 Program wait mode
0
Wait disabled mode1
1 Pin wait mode0
Pin auto-wait mode1
Access state control
0 External memory space is designated as 2-state
access space
Wait state insertion in external memory space
accesses is disabled
1 External memory space is designated as 3-state
access space
Wait state insertion in external memory space
accesses is enabled
Bus width control
0 External memory space designated as 16-bit access space
(illegal setting in the H8S/2138 and H8S/2134)
1 External memory space designated as 8-bit access space