Special Function Register (Sfr) Area; Data Memory Addressing - NEC 78K0S/KA1+ Preliminary User's Manual

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3.1.3 Special function register (SFR) area

Special function registers (SFRs) of on-chip peripheral hardware are allocated to the area of FF00H to FFFFH (see
Table 3-3).

3.1.4 Data memory addressing

The 78K0S/KA1+ is provided with a wide range of addressing modes to make memory manipulation as efficient as
possible. The data memory area (FE80H to FFFFH or FE00H to FFFFH) can be accessed using a unique addressing
mode according to its use, such as a special function register (SFR). Figures 3-3 and 3-4 illustrate the data memory
addressing.
F F F F H
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F F 2 0 H
F E 1 F H
F F 0 0 H
F E F F H
F E 8 0 H
F E 7 F H
0 8 0 0 H
0 7 F F H
0 0 0 0 H
28
CHAPTER 3 CPU ARCHITECTURE
Figure 3-3. Data Memory Addressing (
Special function registers (SFR)
256 × 8 bits
Internal high-speed RAM
128 × 8 bits
Use prohibted
Flash memory
2,048 × 8 bits
Preliminary User's Manual U16898EJ1V0UD
µ
PD78F9221)
SFR addressing
Short direct addressing
Direct addressing
Register indirect addressing
Based addressing