h8s-2649 Renesas Electronics Corporation., h8s-2649 Datasheet - Page 152

• Manufacturer Part Number: h8s-2649
• Description: Renesas 16-bit Single-chip Microcomputer H8s Family/h8s/2600 Series
• Manufacturer: Renesas Electronics Corporation.

Section 7 Bus Controller (BSC)
Table 7.2
(n = 0 to 7)
7.4.3
The memory interfaces in this LSI allow direct connection of ROM, SRAM, and so on.
The initial state of each area is 3-state access space with the basic bus interface. The initial bus
width is selected according to the operating mode.
Area 0: Area 0 includes on-chip ROM in expanded mode with on-chip ROM enabled and the
space excluding on-chip ROM is external address space. In expanded mode with on-chip ROM
disabled, all of area 0 is external address space.
Either basic bus interface or burst ROM interface can be selected for area 0.
Areas 1 to 6: In externally expanded mode, areas 1 to 6 are all external address space.
Only the basic bus interface can be used for areas 1 to 6.
Rev. 2.00 Dec. 05, 2005 Page 114 of 724
REJ09B0200-0200
ABWCR
ABWn
0
1
Memory Interfaces
Bus Specifications for Each Area (Basic Bus Interface)
ASTCR
ASTn
0
1
0
1
Wn1
—
0
1
—
0
1
WCRH, WCRL
Wn0
—
0
1
0
1
—
0
1
0
1
Bus Width
16
8
Bus Specifications (Basic Bus Interface)
Access
States
2
3
2
3
Program Wait
States
0
0
1
2
3
0
0
1
2
3