CHAPTER 3 CPU ARCHITECTURE
Preliminary User’s Manual U16898EJ1V0UD
28
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.
Figure 3-3. Data Memory Addressing (
µ
PD78F9221)
Special function registers (SFR)
256
×
8 bits
Internal high-speed RAM
128
×
8 bits
Flash memory
2,048
×
8 bits
Use prohibted
Direct addressing
Register indirect addressing
Based addressing
SFR addressing
Short direct addressing
F F F F H
F F 0 0 H
F E F F H
F F 2 0 H
F E 1 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
www.DataSheet4U.com
www.DataSheet4U.com