CHAPTER 3 CPU ARCHITECTURE
3.1 Memory Space
The µPD789426, 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 (µPD789425, 789435)
FFFFH
Special function registers
256 × 8 bits
FF00H
FEFFH
Internal high-speed RAM
512 × 8 bits
FD00H
FCFFH
Reserved
FA05H
FA04H
LCD display RAM
5 × 4 bits
Data
FA00H
F9FFH
memory space
2FFFH
Reserved
3000H
2FFFH
Program area
0080H
007FH
Internal ROM
Program
memory space
12288 × 8 bits
CALLT table area
Program area
0040H
003FH
0022H
0021H
Vector table area
0000H
0000H
User’s Manual U15075EJ1V0UM00
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NEC [ NEC ]
