Zilog Z8F0130 Manuale Utente Scaricare il pdf (Pagina 253)

100

101

eZ8

™

CPU Core

User Manual

UM012820-0810 SWAP Instruction

238

Escaped Mode Addressing

Using Escaped Mode Addressing, address modes R or IR can specify 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 Register BCh contains the value B3h (10110011b), the following state-

ment leaves the value 3Bh (00111011b) in Register BCh and clears the Z

and S flags:

SWAP

BCh

Object Code: F0 BC

If Working Register R5 contains the value BCh and Register BCh contains

the value

B3h (10110011b), the following statement leaves the value

3Bh (00111011b) in Register BCh and clears the Z and S flags:

SWAP @R5h



Object Code: F1 E5

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