Zilog Z8F0130 Manual do Utilizador descarregar pdf (Página 92)

100

101

eZ8

™

CPU Core

User Manual

UM012820-0810 ADCX Instruction

ADCX

Definition

Add with Carry using Extended Addressing.

Syntax

ADCX dst, src

Operation

dst



dst + src + C

Description

For this new eZ8 extended addressing instruction, add the source operand

and the Carry (C) flag to the destination operand. Perform two’s-comple

ment addition. Store the sum in the destination operand. The contents of

the source operand are not affected. In multiple-precision (multibyte)

arithmetic, this instruction permits the carry from the addition of low-

order byte operations to be carried into the addition of high-order bytes.

The destination and source operands use 12-bit addresses to access any

address in the Register File.

Flags

C Set if there is a carry from bit 7; reset otherwise

Z Set if the result is zero; reset otherwise

S Set if the result is negative; reset otherwise

V Set if an arithmetic overflow occurs; reset otherwise

D Reset to 0

H Set if there is a carry from bit 3 of the result; reset otherwise

1 2 ... 87 88 89 90 91 92 93 94 95 96 97 ... 313 314

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