Zilog Z8F0130 Bedienungsanleitung PDF herunterladen (Seite 142)

100

101

eZ8

™

CPU Core

User Manual

UM012820-0810 CPCX Instruction

127

CPCX

Definition

Compare with Carry using Extended Addressing.

Syntax

CPCX dst, src

Operation

dst - src - C

Description

For this new eZ8 extended addressing instruction, the source operand

with the C bit is compared to (subtracted from) the destination operand

and the appropriate flags are set accordingly. The contents of both oper

ands are unaffected. For multiprecision operation, repeating this instruc-

tion enables multibyte compares. Only if the initial state of the Zero flag

is 1 and the result of the compare is 0 is the Zero flag set.

Flags

C Set if a borrow is required by bit 7; reset otherwise

Z Set if the result is zero and the initial Zero flag is 1; reset otherwise

S Set if the result is negative; reset otherwise

V Set if an arithmetic overflow occurs; reset otherwise

D Unaffected

H Unaffected

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