Chapter 4 Cpu Architecture; Memory Space - NEC PD789860 User Manual

4.1 Memory Space

µ
The PD789860, 789861 Subseries can each access up to 64 KB of memory space. Figures 4-1 and 4-2 show
the memory maps.
F F F F H
F F 0 0 H
F E F F H
F E 8 0 H
F E 7 F H
F 8 2 0 H
F 8 1 F H
F 8 0 0 H
F 7 F F H
Data memory
space
1 0 0 0 H
0 F F F H
Program memory
space
0 0 0 0 H

CHAPTER 4 CPU ARCHITECTURE

Figure 4-1. Memory Map (
Special function registers
(SFR)
256 × 8 bits
Internal high-speed RAM
128 × 8 bits
Reserved
EEPROM
(data memory)
32 × 8 bits
Reserved
Internal ROM
4,096 × 8 bits
User's Manual U14826EJ5V0UD
µ
PD789860, 789861)
0 F F F H
0 0 8 0 H
0 0 7 F H
0 0 4 0 H
0 0 3 F H
0 0 0 E H
0 0 0 D H
0 0 0 0 H
Program area
CALLT table area
Program area
Vector table area
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