Zilog Z16F2810 Instrukcja Użytkownika Pobierz pdf (Strona 185)

UM018809-0611 SUB Instruction

ZNEO

CPU Core

User Manual

169

SUB

Definition

Subtract

Syntax

SUB dst, src

Operation

dst  dst – src

Description

This instruction subtracts the source operand from the destination operand. The result is stored in

the destination address or register. The contents of the source operand are unaffected. The ZNEO

CPU performs subtraction by adding the two’s complement of the source operand to the destina-

tion operand.

Flags

Flags are set based on the memory destination size, or 32 bits for register destinations.

76543210

C Z S V B CIRQE IRQE

*****–––

Legend

C = Set to 1 if the result generated a borrow; otherwise set to 0.

Z = Set to 1 if the result is zero; otherwise, set to 0.

S = Set to 1 if the result msb is 1; otherwise set to 0.

V = Set to 1 if an arithmetic overflow occurs; otherwise set to 0.

B = Set to 1 if the initial destination or source value is 0; otherwise set to 0.

CIRQE = No change.

IRQE = No change.

Note:

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