HD6413008F RENESAS [Renesas Technology Corp], HD6413008F Datasheet - Page 163

• Manufacturer Part Number: HD6413008F
• Description: Renesas 16-Bit Single-Chip Microcomputer H8 Family/H8/300H Series
• Manufacturer: RENESAS [Renesas Technology Corp]

Table 6.3
ABWCR ASTCR WCRH/WCRL
ABWn
0
1
Note: n = 0 to 7
6.3.3
As its memory interface, the H8/3008 has only a basic bus interface that allows direct connection
of ROM, SRAM, and so on. It is not possible to select a DRAM interface that allows direct
connection of DRAM, or a burst ROM interface that allows direct connection of burst ROM.
6.3.4
For each of areas 0 to 7, the H8/3008 can output a chip select signal (CS
when the corresponding area is selected in expanded mode. Figure 6.4 shows the output timing of
a CSn signal.
Output of CS
(DDR) of the corresponding port.
In the expanded modes with on-chip ROM disabled, a reset leaves pin CS
pins CS
bits must be set to 1. In the expanded modes with on-chip ROM enabled, a reset leaves pins CS
CS
be set to 1. For details, see section 7, I/O Ports.
3
in the input state. To output chip select signals CS
1
to CS
ASTn
0
1
0
1
Memory Interfaces
Chip Select Signals
Bus Specifications for Each Area (Basic Bus Interface)
0
3
to CS
in the input state. To output chip select signals CS
Wn1
⎯
0
1
⎯
0
1
3
: Output of CS
Wn0
⎯
0
1
0
1
⎯
0
1
0
1
0
to CS
Bus Specifications (Basic Bus Interface)
Bus Width
16
8
3
is enabled or disabled in the data direction register
Access States
2
3
2
3
0
to CS
Rev.4.00 Aug. 20, 2007 Page 119 of 638
3
, the corresponding DDR bits must
1
to CS
0
3
to CS
, the corresponding DDR
0
in the output state and
Program Wait States
0
0
1
2
3
0
0
1
2
3
7
) that goes low
REJ09B0395-0400
6. Bus Controller
0
to