Mode 1
Expanded Mode without
On-Chip ROM
Mode 2
Expanded Mode with
On-Chip ROM
Mode 3
Single-Chip Mode
H'0000
H'0000
H'0000
Vector table
Vector table
Vector table
H'004B
H'004C
H'004B
H'004C
H'004B
H'004C
On-chip ROM
49,152 bytes
On-chip ROM
49,152 bytes
External address space
H'BFFF
H'C000
H'BFFF
H'C000
Reserved*1
Reserved*1
H'EF7F
H'EF80
External address space
H'F77F
H'F780
H'F77F
H'F780
H'F77F
H'F780
On-chip RAM*2
2,048 bytes
,
On-chip RAM
2,048 bytes
On-chip RAM*2
2,048 bytes
,
H'FF7F
H'FF80
H'FF87
H'FF88
H'FF7F
H'FF80
H'FF87
H'FF88
H'FF7F
External address space
On-chip register field
External address space
On-chip register field
H'FF88
H'FFFF
On-chip register field
H'FFFF
H'FFFF
Notes: *1 Do not access reserved areas.
*2 External memory can be accessed at these addresses when the RAME bit in the system
control register (SYSCR) is cleared to 0.
Figure 3.2 H8/3436 Address Space Map
62
HITACHI [ HITACHI SEMICONDUCTOR ]
