HD643303x Hitachi, HD643303x Datasheet - Page 132

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

6.3.4 Interconnections with Memory (Example)
For each area, the bus controller can select two- or three-state access. In three-state-access areas,
wait states can be inserted in a variety of modes, simplifying the connection of both high-speed
and low-speed devices.
Figure 6-10 shows an example of interconnections between the H8/3032 Series and memory.
Figure 6-10 shows a memory map for this example.
A 32-kword 8-bit EPROM is connected to area 0. This device is accessed in three states via a 8-
bit bus.
Two 32-kword 8-bit SRAM devices (SRAM1 and SRAM2) are connected to area 1. These
devices are accessed in two states via a 8-bit bus.
One 32-kword 8-bit SRAM (SRAM3) is connected to area 7. This device is accessed via an
8-bit bus, using three-state access with an additional wait state inserted in pin auto-wait mode.
Note:
The bus width and the number of access states of the on-chip memories and registers
are fixed; they cannot be changed by register setting.
H'00000
H'0FFFF
H'10000
H'17FFF
H'18000
H'1FFFF
H'20000
H'2FFFF
H'30000
H'3FFFF
H'E0000
H'E7FFF
H'FFFFF
Figure 6-10 Memory Map (Example)
On-chip I/O registers
On-chip ROM
On-chip RAM
SRAM1, 2
Not used
Not used
Not used
EPROM
SRAM3
117
Area 0
8-bit, three-state-access area
Area 1
8-bit, two-state-access area
Area 7
8-bit, three-state-access area
(one auto-wait state)