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Zilog Z8F0130 User Manual

Page 144

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eZ8

CPU Core

User Manual

UM012820-0810

CPX Instruction

129

CPX

Definition

Compare using Extended Addressing.

Syntax

CPX dst, src

Operation

dst - src

Description

For this new eZ8 extended addressing instruction, the source operand is
compared to (subtracted from) the destination operand and the appropri-
ate flags are set accordingly. The contents of both operands are unaf-
fected.

Flags

C

Set if a borrow is required by 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

Unaffected

H

Unaffected