Zilog Z8F0130 Manual de usuario descargar pdf (Pagina 135)

100

101

eZ8

™

CPU Core

User Manual

UM012820-0810 COM Instruction

120

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 08h contains 24h (00100100b), the following statement

leaves the value

DBh (11011011b) in Register 08h, sets the S flag, and

clears the Z and V flags:

COM

08h

Object Code: 60 08

If Register 08h contains the value 24h, and Register 24h contains the

value

FFh (11111111b), the following statement leaves the value 00h

(

00000000b) in Register 24h, sets the Z flag is set and clears the V and S

flags:

COM @

08h

Object Code: 61 08

1 2 ... 130 131 132 133 134 135 136 137 138 139 140 ... 313 314

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