Zilog Z8F0130 Manual do Utilizador descarregar pdf (Página 219)

100

101

eZ8

™

CPU Core

User Manual

UM012820-0810 PUSHX Instruction

204

Attributes

Escaped Mode Addressing

Using Escaped Mode Addressing, address mode ER can specify a work-

ing register with 4-bit addressing.

If the high byte of the source or destination address is EEh (11101110b),

a working register is inferred. For example, the operand

EE3h selects

Working Register R3. The full 12-bit address is provided by

{RP[3:0],

RP[7:4], 3h}

To access registers on Page Eh (addresses E00h to EFFh), set the Page

Pointer, RP[3:0], to

Eh and set the Working Group Pointer, RP[7:4], to

the preferred Working Group.

Sample Usage

If the Stack Pointer contains D24h, the following statement stores the

contents of Register

FCAh in location D23h:

PUSHX

FCAh

Object Code: C8 FC A0

After the PUSHX operation, the Stack Pointer contains the value D23h.

Mnemonic Source

Op Code

(Hex) Operand 1 Operand 2 Operand 3

PUSHX ER2 C8 ER2[11:4] {ER2[3:0],

0h}

—

1 2 ... 214 215 216 217 218 219 220 221 222 223 224 ... 313 314

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