NEC 78K0 User Manual page 72

Figure 3-9. Correspondence Between Data Memory and Addressing (
FFFFH
Special function registers (SFR)
256 × 8 bits
FF20H
FF1FH
FF00H
FEFFH
General-purpose registers
32 × 8 bits
FEE0H
FEDFH
Internal high-speed RAM
1024 × 8 bits
FE20H
FE1FH
FB00H
FAFFH
Reserved
FA20H
FA1FH
Buffer RAM
32 × 8 bits
FA00H
F9FFH
Reserved
F800H
F7FFH
Internal expansion RAM
1024 × 8 bits
F400H
F3FFH
External memory
1024 × 8 bits
F000H
EFFFH
Internal ROM
61440 × 8 bits
0000H
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CHAPTER 3 CPU ARCHITECTURE
SFR addressing
Register addressing
*
User's Manual U15947EJ2V0UD
µ
PD780148)
Short direct
addressing
Direct addressing
Register indirect addressing
Based addressing
Based indexed addressing