Zilog Z8F0130 Manual de usuario descargar pdf (Pagina 51)

100

101

eZ8

™

CPU Core

User Manual

UM012820-0810 Addressing Modes

Registers or Register Pairs may be accessed using 8-bit addresses sup-

plied in the operands. Any of the 256 registers on the current Register File

Page can be accessed using 8-bit addressing. The upper 4-bits of the 

12-bit address is provided by the Page Pointer,

RP[3:0]. The full 12-bit

address is provided by

{RP[3:0], Address[7:0]}.

Figure 9 displays using 8-bit addressing, the destination and/or source

address specified corresponds to a register in the Register File.

Working Registers or Working Register Pairs can be accessed using 4-bit

addresses supplied in the operands. With 4-bit Addressing, the destination

and/or source addresses point to one of the 16 possible Working Registers

Figure 9. Register Addressing Using 8-Bit Addresses

One 8-bit

Program Memory

Address

(dst)

One Operand

Instruction

(Example)

Op Code

dst[7:0]

Destination

12-bit address is

{RP[3:0], dst[7:0]}

1 2 ... 46 47 48 49 50 51 52 53 54 55 56 ... 313 314

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Zilog Z8F0130 Manual de usuario Pagina 51

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