NEC PD78F9488 - Manual (Page 54)

CHAPTER 3 CPU ARCHITECTURE
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User’s Manual U15331EJ4V1UD
3.1.4 Data memory addressing
The µPD789489 Subseries is provided with a variety of addressing modes to make memory manipulation as
efficient as possible. At the addresses corresponding to data memory area (FB00H to FFFFH) especially, specific
addressing modes that correspond to the particular function of an area, such as the special function registers, are
available. Figures 3-5 to 3-8 show the data memory addressing modes.
Figure 3-5. Data Memory Addressing ( µPD789488)
Special function registers
256 × 8 bits
Internal high-speed RAM
1024 × 8 bits
LCD display RAM
28 × 4 bits
F F F F H
8 0 0 0 H
7 F F F H
0 0 0 0 H
Direct addressing
Register indirect addressing
Based addressing
F F 0 0 H
F E F F H
F F 2 0 H
F F 1 F H
F E 2 0 H
F E 1 F H
SFR addressing
Short direct addressing
F B 0 0 H
F A F F H
F A 1 C H
F A 1 B H
Reserved
F A 0 0 H
F 9 F F H
Reserved
Internal ROM
32768 × 8 bits