CHAPTER 3 CPU ARCHITECTURE
Preliminary User’s Manual U19014EJ1V0UD
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3.1.5 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
µ
PD78F0730, 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. Figure 3-2 shows correspondence between data memory and addressing. For details of each
addressing mode, see
3.4 Operand Address Addressing
.
Figure 3-2. Correspondence Between Data Memory and Addressing
Special function registers (SFR)
256
×
8 bits
Short direct
addressing
SFR addressing
F F F F H
F F 2 0 H
F F 1 F H
0 0 0 0 H
F F 0 0 H
F E F F H
F E E 0 H
F E D F H
F E 2 0 H
F E 1 F H
Internal high-speed RAM
1024
×
8 bits
General-purpose registers
32
×
8 bits
USB area
303
×
8 bits
Reserved
Flash memory
16384
×
8 bits
Register addressing
Direct addressing
Register indirect addressing
Based addressing
Based indexed addressing
F 8 0 0 H
F 7 F F H
F 9 D 1 H
F 9 D 0 H
4 0 0 0 H
3 F F F H
F B 0 0 H
F A F F H
Internal expansion RAM
2048
×
8 bits
Reserved
F 0 0 0 H
E F F F H
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