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Table 7-3
Bus Specifications for Each Area (Basic Bus Interface)
ABWCR
ASTCR
ABWn
ASTn
0
0
1
1
0
1
7.3.3
Memory Interfaces
The H8S/2633 Series memory interfaces comprise a basic bus interface that allows direct
connection or ROM, SRAM, and so on, DRAM interface with direct DRAM connection and a
burst ROM interface that allows direct connection of burst ROM. The memory interface can be
selected independently for each area.
An area for which the basic bus interface is designated functions as normal space, and areas set for
DRAM interface are DRAM spaces an area for which the burst ROM interface is designated
functions as burst ROM space.
156
WCRH, WCRL
Wn1
Wn0
—
—
0
0
1
1
0
1
—
—
0
0
1
1
0
1
Bus Specifications (Basic Bus Interface)
Bus Width
Access States
16
2
3
8
2
3
Program Wait
States
0
0
1
2
3
0
0
1
2
3
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