Zilog Z8F0130 Manual do Utilizador descarregar pdf (Página 247)

100

101

eZ8

™

CPU Core

User Manual

UM012820-0810 SUB Instruction

232

SUB

Definition

Subtract.

Syntax

SUB dst, src

Operation

dst



dst - src

Description

This instruction subtracts the source operand from the destination oper-

and. The destination operand stores the result. The source operand con-

tents are unaffected. The eZ8 CPU performs 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 ... 242 243 244 245 246 247 248 249 250 251 252 ... 313 314

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