156
Table 7-3
Bus Specifications for Each Area (Basic Bus Interface)
ABWCR
ASTCR
WCRH, WCRL
Bus Specifications (Basic Bus Interface)
ABWn
ASTn
Wn1
Wn0
Bus Width
Access States
Program Wait
States
0
0
—
—
16
2
0
1
0
0
3
0
1
1
1
0
2
1
3
1
0
—
—
8
2
0
1
0
0
3
0
1
1
1
0
2
1
3
7.3.3
Memory Interfaces
The H8S/2646 Series memory interfaces comprise a basic bus interface that allows direct
connection or ROM, SRAM, and so on, 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 an area for
which the burst ROM interface is designated functions as burst ROM space.
Содержание H8S/2645
Страница 4: ......
Страница 16: ......
Страница 58: ...26 ...
Страница 110: ...78 ...
Страница 120: ...88 ...
Страница 132: ...100 ...
Страница 160: ...128 ...
Страница 172: ...140 ...
Страница 235: ...203 Transfer SAR or DAR DAR or SAR Block area First block Nth block Figure 8 8 Memory Mapping in Block Transfer Mode ...
Страница 418: ...386 ...
Страница 444: ...412 ...
Страница 530: ...498 ...
Страница 562: ...530 ...
Страница 642: ...610 ...
Страница 662: ...630 ...
Страница 688: ...656 ...
Страница 756: ...724 ...
Страница 784: ...752 ...
Страница 812: ...780 ...
Страница 837: ...805 A 2 Instruction Codes Table A 2 shows the instruction codes ...
Страница 1152: ...1120 ...