Zilog Z16F2810 Bedienungsanleitung PDF herunterladen (Seite 112)

DEC Instruction UM018809-0611

ZNEO

CPU Core

User Manual

DEC

Definition

Decrement

Syntax

DEC dst

Operation

dst  dst

– 1

Description

The contents of the destination operand are decremented by one.

Flags

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

Syntax and Opcodes

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 value was 0; otherwise set to 0.

CIRQE = No change.

IRQE = No change.

Instruction, Operands Word 0 Word 1 Word 2

DEC Rd

{AA1H, Rd} 01H

DEC addr16 {ADAH, 1x11B} addr16

DEC addr32 {ADBH, 1x11B} addr[31:16] addr[15:0]

DEC (Rd) {ACH, 1x11B, Rd}

Note:

1 2 ... 107 108 109 110 111 112 113 114 115 116 117 ... 215 216

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Zilog Z16F2810 Bedienungsanleitung Seite 112