Zilog Z8F0130 Bedienungsanleitung PDF herunterladen (Seite 139)

100

101

eZ8

™

CPU Core

User Manual

UM012820-0810 CPC Instruction

124

CPC

Definition

Compare with Carry.

Syntax

CPC dst, src

Operation

dst - src - C

Description

For this new eZ8 instruction, the source operand with the C bit is com-

pared to (subtracted from) the destination operand. The contents of both

operands are unaffected. For multiprecision operation, repeating this

instruction enables multibyte compares. The Zero flag is set only if the

initial state of the Zero flag is 1 and the result of the compare is 0.

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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