Zilog Z8F0130 Bedienungsanleitung PDF herunterladen (Seite 49)

100

101

eZ8

™

CPU Core

User Manual

UM012820-0810 Addressing Modes

Addressing Modes

The eZ8

™

CPU provides six addressing modes:

•

Indirect Register (IR)

•

Indexed (X)

•

Direct (DA)

•

Relative (RA)

•

Immediate Data (IM)

With the exception of immediate data and condition codes, all operands

are expressed as either Register File, Program Memory, or Data Memory

addresses. Registers use 12-bit addresses in the range of

000h–FFFh.

Program Memory and Data Memory use 16-bit addresses (register pairs)

in the range of

0000h–FFFFh.

numbered address in the range of 0, 2, ..., 14. Register Pairs use 8-bit

addresses and must be specified as an even-numbered address in the range

of 0, 2, …, 254.

In the following definitions of Addressing Modes, the use of 'register' can

imply a register, a register Pair, a working register, or a working register

pair, depending on the context.

Refer to the Zilog Product Specification specific to your Z8 Encore!

device for details on the Program, Data, and Register File memory types

and address ranges available.

1 2 ... 44 45 46 47 48 49 50 51 52 53 54 ... 313 314

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