Datasheet

Section 3 MCU Operating Modes
Page 92 of 1408 R01UH0309EJ0500 Rev. 5.00
Sep 24, 2012
H8S/2456, H8S/2456R, H8S/2454 Group
H'000000
H'FFFA00
On-chip ROM
On-chip RAM/
External address space*
3
H'FFFFFF
H'FFFF00
H'FFFF20
H'040000
H'FEC000
H'FFC000
H'FFD000
H'FE8000
H'F02000
H'F00000
H'000000
H'FFFA00
On-chip ROM
H'FFFFFF
H'FFFF00
H'FFFF20
H'040000
External address space
H'FEC000
H'FFC000
H'FFD000
H'FE8000
H'F02000
H'F00000
External address space
Internal I/O registers
External address space
Internal I/O registers
External address space/
Reserved area
*
2
*
4
Reserved area
*
4
On-chip RAM/External address space/
Reserved area*
1
*
5
External address space/
Reserved area
*
2
*
4
External address
space
External address space/
Reserved area
*
2
*
4
External address space/
Reserved area
*
2
*
4
Internal I/O registers
Internal I/O registers
Reserved area
*
4
Reserved area
*
4
Notes: 1. This area is specified as the external address space by clearing the RAME bit in SYSCR to 0.
2. This area is specified as the external address space when EXPE = 1 and the reserved area when EXPE = 0.
3. While EXPE = 1, this area is specified as the external address space when RAME = 0 and the on-chip RAM area
when RAME = 1. While EXPE = 0, this area is specified as the on-chip RAM area.
4. A reserved area should not be accessed.
Data flash area 8 Kbytes
ROM: 256 Kbytes
RAM: 64 Kbytes / 48 Kbytes
Mode 4
(Expanded mode with
on-chip ROM enabled)
ROM: 256 Kbytes
RAM: 64 Kbytes / 48 Kbytes
Mode 7
(Single-chip activation expanded mode
with on-chip ROM enabled)
Reserved area*
4
Reserved area*
4
H'080000
H'080000
Data flash area 8 Kbytes
H'FF0000 H'FF0000
On-chip RAM/
External address space*
1
On-chip RAM/External address space/
Reserved area*
3
*
5
Reserved area
*
4
5. Area from H'FEC000 to H'FEFFFF in the H8S/24568, H8S/24568R, and H8S/24548 Groups is reserved and
should not be accessed.
Figure 3.2 Memory Map in Each Operating Mode (ROM: 256-Kbyte Version):
H8S/24569, H8S/24569R, H8S/24568, H8S/24568R, H8S/24549, and H8S/24548