CHAPTER 3 CPU ARCHITECTURE
User’s Manual U17446EJ3V1UD
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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/KB1+ is provided with a wide range of addressing modes to make memory manipulation as efficient as
possible. The area (FE00H to FEFFH) which contains a data memory and the special function register area (SFR)
can be accessed using a unique addressing mode in accordance with each function. Figures 3-3 and 3-4 illustrate the
data memory addressing.
Figure 3-3. Data Memory Addressing (
μ
PD78F9232)
Special function registers (SFR)
256
×
8 bits
Internal high-speed RAM
256
×
8 bits
Flash memory
4,096
×
8 bits
Use prohibited
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 F 1 F H
F E 2 0 H
F E 1 F H
F E 0 0 H
F D F F H
1 0 0 0 H
0 F F F H
0 0 0 0 H
Содержание 78K0S/KB1+
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