3.4
Address Space Map in Each Operating Mode
Figures 3.1 and 3.2 show memory maps of the H8/3437, H8/3436, and H8/3434 in modes 1, 2,
and 3.
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
61,312 bytes
On-chip ROM
63,360 bytes
External address space
H'EF7F
H'EF80
External address space
H'F77F
H'F780
H'F77F
H'F780
H'FF7F
H'FF80
On-chip RAM*,
2,048 bytes
On-chip RAM*,
2,048 bytes
On-chip RAM,
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
Note: * External memory can be accessed at these addresses when the RAME bit in the system
control register (SYSCR) is cleared to 0.
Figure 3.1 H8/3437 Address Space Map
61
HITACHI [ HITACHI SEMICONDUCTOR ]
