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UM018809-0611 NOFLAGS Instruction

ZNEO

CPU Core

User Manual

129

NOFLAGS

Definition

No Flags Modifier

Syntax

NFLAGS

Operation

Modify the next instruction to suppress setting flags as a result of the operation.

Description

This modifier prefix suppresses the setting of condition flags as a result of the next instruction.

The operation is performed and a result (if any) is written, but the result does not affect the Flags

The NOFLAGS modifier does not suppress IRET, POPF, or any LD or POP instruction that

overwrites the FLAGS register directly, for example, LD.B FLAGS:IODATA, R0.

Flags

Flags are not affected by this instruction or the next instruction, unless the next instruction over-

writes the FLAGS register directly.

Syntax and Opcodes

Example

Before:

R3=16H, R11=20H

NOFLAGS ;Object Code: 0005

SUB R3, R11 ;Object code: A1B3

After:

R3=FFFF_FFF6H, Flags unchanged

Instruction, Operands Word 0 Word 1 Word 2

NOFLAGS 0005H

Note:

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