Zilog Z8F0130 Manual de usuario descargar pdf (Pagina 215)

100

101

eZ8

™

CPU Core

User Manual

UM012820-0810 POPX Instruction

200

Attributes

Escaped Mode Addressing

Using Escaped Mode Addressing, address mode ER specifies a working

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 (control Registers FFEh and FFFh) contains the value

D70h and Register D70h contains the value 44h, the following statement

loads the value

44h into Register 345h:

POPX

345h

Object Code: D8 34 50

After the POP operation, the Stack Pointer contains the value D71h. The

contents of Register

D70h are not affected.

Mnemonic Destination

Code

(Hex) Operand 1 Operand 2 Operand 3

POPX ER1 D8 ER1[11:4] {ER1[3:0],

0h}

—

1 2 ... 210 211 212 213 214 215 216 217 218 219 220 ... 313 314

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Zilog Z8F0130 Manual de usuario Pagina 215

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