UPD78F9418A NEC, UPD78F9418A Datasheet - Page 50

• Manufacturer Part Number: UPD78F9418A
• Description: (UPD7894xxA) 8-Bit Single Chip Microcontrollers
• Manufacturer: NEC

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3.1.4 Data memory addressing
manipulation as efficient as possible. In the area that holds data memory (FD00H to FFFFH) especially, specific
modes of addressing that correspond to the particular function of an area, such as the special function registers
(SFR) or general-purpose registers, are available. Figures 3-5 through 3-8 show the data memory addressing
modes.
50
The PD789407A and PD789417A Subseries are provided with a variety of addressing modes to make memory
FCFFH
FA1CH
FD00H
FA1BH
FEFFH
FA00H
F9FFH
2FFFH
FFFFH
FF1FH
FE20H
FE1FH
FF20H
FF00H
3000H
0000H
Special function registers (SFR)
Figure 3-5. Data Memory Addressing ( PD789405A and PD789415A)
RAM space for LCD data
Internal high-speed RAM
12288
Internal ROM
256
512
28
Reserved
Reserved
4 bits
8 bits
8 bits
8 bits
CHAPTER 3 CPU ARCHITECTURE
User’s Manual U13952EJ3V0UD
SFR addressing
Short direct
addressing
Direct addressing
Register indirect
addressing
Based addressing