Zilog Z8F0130 Bedienungsanleitung PDF herunterladen (Seite 235)

100

101

eZ8

™

CPU Core

User Manual

UM012820-0810 SBCX Instruction

220

SBCX

Definition

Subtract with Carry using Extended Addressing.

Syntax

SBCX dst, src

Operation

dst



dst - src - C

Description

This new eZ8 extended addressing instruction subtracts the source oper-

and and the Carry (C) flag from the destination. The destination stores the

result. The contents of the source 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 per-

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

subtracted 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 the result is negative; 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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