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Example of Wait State Control Settings: A reset initializes ASTCR and WCER to H'FF and
WCR to H'F3, selecting programmable wait mode and three wait states for all areas. Software can
select other wait modes for individual areas by modifying the ASTCR, WCER, and WCR settings.
Figure 6-9 shows an example of wait mode settings.
Area 0
programmable wait mode
Area 1
programmable wait mode
Area 2
Area 3
Area 4
no wait states inserted
Area 5
no wait states inserted
Area 6
no wait states inserted
Area 7
no wait states inserted
Note: Wait states cannot be inserted in areas designated for two-state access by ASTCR.
122
3-state-access area,
3-state-access area,
3-state-access area,
pin wait mode 0
3-state-access area,
pin wait mode 0
2-state-access area,
2-state-access area,
2-state-access area,
2-state-access area,
Bit:
ASTCR H'0F:
WCER H'33:
WCR H'F3:
Figure 6-9 Wait Mode Settings (Example)
7
6
5
4
0
0
0
0
0
0
1
1
—
—
—
—
3
2
1
0
1
1
1
1
0
0
1
1
0
0
1
1
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