User’s Manual U15075EJ2V1UD
46
CHAPTER 3 CPU ARCHITECTURE
3.1 Memory Space
The
µ
PD789426, 789436, 789446, and 789456 Subseries can access 64 KB of memory space. Figures 3-1
through 3-6 show the memory maps.
Figure 3-1. Memory Map (
µ
PD789425, 789435)
Special function registers
256
×
8 bits
Internal high-speed RAM
512
×
8 bits
LCD display RAM
5
×
4 bits
Reserved
Reserved
Internal ROM
12288
×
8 bits
FFFFH
FF00H
FEFFH
FD00H
FCFFH
FA00H
F9FFH
0000H
Program
memory space
Data
memory space
2FFFH
0000H
Program area
0080H
007FH
Program area
0040H
003FH
CALLT table area
0022H
0021H
Vector table area
FA05H
FA04H
3000H
2FFFH