HD643303x Hitachi, HD643303x Datasheet - Page 69

• Manufacturer Part Number: HD643303x
• Description: Hitachi Microcomputer
• Manufacturer: Hitachi

2.9.4 Access to External Address Space
The external address space is divided into eight areas (areas 0 to 7). Bus-controller settings
determine whether each area is accessed via an 8-bit or 16-bit bus, and whether it is accessed in
two or three states. For details see section 6, Bus Controller.
ø
Address bus
AS
D
7
,
to D
RD HWR LWR
Figure 2-18 Pin States during Access to On-Chip Supporting Modules
0
,
,
High
T
1
54
High impedance
Address
T
2
T
3