HD64F2149 Datasheet, PDF (958/1035 Pages) Renesas Technology Corp – Hitachi 16-Bit Single-Chip Microcomputer

WSCR—Wait State Control Register
Bit
Initial value
Read/Write
7
RAMS
0
R/W
6
RAM0
0
R/W
5
ABW
1
R/W
H'FFC7
Bus Controller
4
3
2
1
AST WMS1 WMS0 WC1
1
0
0
1
R/W
R/W
R/W
R/W
0
WC0
1
R/W
Reserved bits
Wait count 1 and 0
0 0 No program wait
states are inserted
1 1 program wait state
is inserted in external
memory space
accesses
1 0 2 program wait states
are inserted in external
memory space
accesses
1 3 program wait states
are inserted in external
memory space
accesses
Wait mode select 1 and 0
0 0 Program wait mode
1 Wait disabled mode
1 0 Pin wait mode
1 Pin auto-wait mode
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
1 External memory space designated as 8-bit access space
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