Data Memory Addressing - NEC mPD78F0730 Preliminary User's Manual

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.
F F F F H
Special function registers (SFR)
F F 2 0 H
F F 1 F H
F F 0 0 H
F E F F H
General-purpose registers
F E E 0 H
F E D F H
F E 2 0 H
F E 1 F H
F B 0 0 H
F A F F H
F 9 D 1 H
F 9 D 0 H
F 8 0 0 H
F 7 F F H
F 0 0 0 H
E F F F H
4 0 0 0 H
3 F F F H
0 0 0 0 H
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CHAPTER 3 CPU ARCHITECTURE
Figure 3-2. Correspondence Between Data Memory and Addressing
256 × 8 bits
32 × 8 bits
Internal high-speed RAM
1024 × 8 bits
USB area
303 × 8 bits
Reserved
Internal expansion RAM
2048 × 8 bits
Reserved
Flash memory
16384 × 8 bits
Preliminary User's Manual U19014EJ1V0UD
SFR addressing
Register addressing
Short direct
addressing
Direct addressing
Register indirect addressing
Based addressing
Based indexed addressing