Zilog Z8F0130 Bedienungsanleitung PDF herunterladen (Seite 232)

100

101

eZ8

™

CPU Core

User Manual

UM012820-0810 SBC Instruction

217

SBC

Definition

Subtract with Carry.

Syntax

SBC dst, src

Operation

dst



dst - src - C

Description

This instruction subtracts the source operand and the Carry (C) flag from

the destination. The destination stores the result. The contents of the

source operand are unaffected. The eZ8 CPU performs subtraction by

adding the two’s-complement of the source operand to the destination

operand. In multiple-precision arithmetic, this instruction permits the

carry (borrow) from the subtraction of low-order operands to be sub

tracted from the subtraction of high-order operands.

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 Bit 7 of the result is set; reset otherwise

V Set if an arithmetic overflow occurs; reset otherwise

D Set to 1

H Set if a borrow is required by bit 3; reset otherwise

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