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User’s Manual U15331EJ4V1UD
CHAPTER 3 CPU ARCHITECTURE
3.1 Memory Space
The
µ
PD789489 Subseries can access 64 KB of memory space. Figures 3-1 to 3-4 show the memory maps.
Figure 3-1. Memory Map (
µ
PD789488)
8 0 0 0 H
7 F F F H
Special function registers
256
×
8 bits
Internal high-speed RAM
1024
×
8 bits
LCD display RAM
28
×
4 bits
F F F F H
F F 0 0 H
F E F F H
F B 0 0 H
F A F F H
0 0 0 0 H
Program memory
space
Data memory
space
7 F F F H
0 0 0 0 H
Program area
0 0 8 0 H
0 0 7 F H
Program area
0 0 4 0 H
0 0 3 F H
CALLT table area
Reserved
0 0 2 E H
0 0 2 D H
Vector table area
Internal ROM
32768
×
8 bits
F A 1 C H
F A 1 B H
F A 0 0 H
F 9 F F H
Reserved
