Zilog Z8F0130 Manual do Utilizador descarregar pdf (Página 250)

100

101

eZ8

™

CPU Core

User Manual

UM012820-0810 SUBX Instruction

235

SUBX

Definition

Subtract using Extended Addressing.

Syntax

SUBX dst, src

Operation

dst



dst - src

Description

This new eZ8 extended addressing instruction subtracts the source oper-

and from the destination operand. The destination operand stores the

result. The source operand contents are unaffected. The eZ8 CPU per

forms subtraction by adding the two’s complement of the source operand

to the destination operand.

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

1 2 ... 245 246 247 248 249 250 251 252 253 254 255 ... 313 314

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