CHAPTER 3 CPU ARCHITECTURE
User’s Manual U16899EJ2V0UD
54
3.1.3 Special function register (SFR) area
On-chip peripheral hardware special function registers (SFRs) are allocated in the area FF00H to FFFFH (refer to
Table 3-6 Special Function Register List in 3.2.3 Special function registers (SFRs)).
Caution Do not access addresses to which SFRs are not assigned.
3.1.4 Data memory addressing
Addressing refers to the method of specifying the address of the instruction to be executed next or the address of
the register or memory relevant to the execution of instructions.
Several addressing modes are provided for addressing the memory relevant to the execution of instructions for the
78K0/KE1+, based on operability and other considerations. For areas containing data memory in particular, special
addressing methods designed for the functions of special function registers (SFR) and general-purpose registers are
available for use. Figures 3-7 to 3-12 show correspondence between data memory and addressing. For details of
each addressing mode, refer to 3.4 Operand Address Addressing.
Figure 3-7. Correspondence Between Data Memory and Addressing (
µ
PD78F0132H)
Special function registers (SFR)
256
×
8 bits
Short direct
addressing
SFR addressing
Internal high-speed RAM
512
×
8 bits
General-purpose registers
32
×
8 bits
Reserved
Flash memory
16384
×
8 bits
Register addressing
Direct addressing
Register indirect addressing
Based addressing
Based indexed addressing
H
0
0
0
0
H
F
F
F
3
H
0
0
0
4
H
F
F
C
F
H
0
0
D
F
H
F
D
E
F
H
0
E
E
F
H
F
F
E
F
H
0
0
F
F
H
F
F
F
F
H
F
1
E
F
H
0
2
E
F
H
F
1
F
F
H
0
2
F
F
Содержание MuPD78F0132H
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