Operand Address Addressing; Data Memory Addressing - NEC 78014Y Series User Manual

5.4 Operand Address Addressing

5.4.1 Data memory addressing

Addressing is a method to specify the instruction address to be executed next and the register and memory address
to be manipulated when instructions are executed. The instruction address to be executed next is addressed by the
program counter (PC) (for details, refer to 5.3 Instruction Address Addressing).
For the addressing of the memory to be manipulated when instructions are executed, the µ PD78014 and 78014Y
Subseries are provided with several addressing modes which take account of optimum manipulability. In particular,
specific types of addressing can be used which match the functions of the special function registers (SFRs), general
registers, etc. Data memory addressing is shown in Figures 5-12 to 5-16.
F F F F H
F F 2 0 H
F F 1 F H
F F 0 0 H
F E F F H
F E E 0 H
F E D F H
www.DataSheet4U.com F E 2 0 H
F E 1 F H
F D 0 0 H
F C F F H
F A E 0 H
F A D F H
F A C 0 H
F A B F H
F A 8 0 H
F A 7 F H
2 0 0 0 H
1 F F F H
0 0 0 0 H
CHAPTER 5 CPU ARCHITECTURE
Figure 5-12. Data Memory Addressing ( µ PD78011B, 78011BY)
Special Function
Registers (SFR)
256 × 8 bits
General Registers
32 × 8 bits
Internal High-Speed RAM
512 × 8 bits
Use Prohibited
Buffer RAM
32 × 8 bits
Use Prohibited
External Memory
55936 × 8 bits
Internal ROM
8192 × 8 bits
SFR addressing
Register addressing
Short direct
addressing
Direct addressing
Register indirect addressing
Based addressing
Based indexed addressing
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