Zilog Z8F0130 Uživatelský manuál stáhnout pdf (Strana 52)

100

101

eZ8

™

CPU Core

User Manual

UM012820-0810 Addressing Modes

within the current Working Register Group. This 4-bit address is com-

bined with the Page Pointer,

RP[3:0], and the Working Group Pointer,

RP[7:4], to form the actual 12-bit address in the Register File. The full

12-bit address is provided by

{RP[3:0], RP[7:4], Address[3:0]}.

Figure 10 displays 4-bit addressing of the Register File.

Escaped Mode Addressing

Escaped mode addressing is used to directly access any Working Register

in the Register File using either an 8-bit or 4-bit addressing methodology.

Figure 10. Register Addressing Using 4-Bit Addresses

Two 4-bit

Program Memory

Addresses

(dst, src)

One Operand

Instruction

(Example)

Op Code

{dst[3:0],

12-bit address is

{RP[3:0],

RP[7:4]

, dst[3:0]}

src[3:0]}

Source

Destination

12-bit address is

{RP[3:0],

RP[7:4]

, src[3:0]}

1 2 ... 47 48 49 50 51 52 53 54 55 56 57 ... 313 314

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