Zilog Z8F0130 Manual de usuario descargar pdf (Pagina 217)

eZ8

™

CPU Core

User Manual

UM012820-0810 PUSH Instruction

202

Escaped Mode Addressing

Using Escaped Mode Addressing, address modes R or IR can specify a

working register. If the source address is prefixed by

Eh (1110b), a work-

ing register is inferred. For example, if Working Register R12 (Ch) is the

preferred source operand, use

ECh as the source operand in the Op Code.

To access registers with addresses

E0h to EFh, either set the Working

Group Pointer,

RP[7:4], to Eh or use indirect addressing.

Sample Usage

If the Stack Pointer contains the value D20h, the following statement

stores the contents of Register

FCh in location D1Fh:

PUSH

FCh

Object Code: 70 FC

After the PUSH operation, the Stack Pointer contains the value D1Fh.

If the Stack Pointer contains the value E61h and Working Register R4

contains

FCh, the following statement stores the contents of Register FCh

in location

E60h:

PUSH @R4



Object Code: 71 E4

After the PUSH operation, the Stack Pointer contains the value E60h.

If the Stack Pointer contains the value D20h, the following statement

stores the value

FCh in location D1Fh:

PUSH #

FCh

Object Code: 1F70FC

After the PUSH operation, the Stack Pointer contains the value D1Fh.

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Zilog Z8F0130 Manual de usuario Pagina 217