Zilog Z8F0130 Manual do Utilizador descarregar pdf (Página 213)

eZ8

™

CPU Core

User Manual

UM012820-0810 POP Instruction

198

Escaped Mode Addressing

Using Escaped Mode Addressing, address modes R or IR specifies a

working register. If the destination address is prefixed by

Eh (1110b), a

working register is inferred. For example, if Working Register R12 (

Ch) is

the preferred destination operand, use

ECh as the destination 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 (control Registers FFEh and FFFh) contains the value

70h and Register 70h contains the value 44h, the following statement

loads the value

44h into Register 34h. After the POP operation, the Stack

Pointer contains

71h:

POP

34h

Object Code: 50 34

The contents of Register 70h are not affected.

If the Stack Pointer (control Registers FFEh and FFFh) contains the value

0080h, memory location 0080h contains the value 55h, and Working

22h, the following statement loads the

value

55h into Register 22h:

POP @R6



Object Code: 51 E6

After the POP operation, the Stack Pointer contains the value 0081h. The

contents of Working Register R6 are not affected.

1 2 ... 208 209 210 211 212 213 214 215 216 217 218 ... 313 314

Sem comentários

Zilog Z8F0130 Manual do Utilizador Página 213