Chapter 3 Cpu Architecture; Memory Space; Memory Map ( Μ Pd789425, 789435) - NEC UPD789426 Series User Manual

3.1 Memory Space

µ
The PD789426, 789436, 789446, and 789456 Subseries can access 64 KB of memory space. Figures 3-1
through 3-6 show the memory maps.
FFFFH
FEFFH
FD00H
FCFFH
FA05H
FA04H
Data
FA00H
memory space
F9FFH
2FFFH
Program
memory space
46

CHAPTER 3 CPU ARCHITECTURE

Figure 3-1. Memory Map (
Special function registers
256 × 8 bits
FF00H
Internal high-speed RAM
512 × 8 bits
Reserved
LCD display RAM
5 × 4 bits
Reserved
3000H
Internal ROM
12288 × 8 bits
0000H
User's Manual U15075EJ2V1UD
µ
PD789425, 789435)
2FFFH
0080H
007FH
0040H
003FH
0022H
0021H
0000H
Program area
CALLT table area
Program area
Vector table area