Datasheet

Instruction Set Description

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4.6.2.23 INV

* INV[.W] Invert destination

* INV.B Invert destination

Syntax

INV dst or INV.W dst

INV.B dst

Operation .not.dst → dst

XOR #0FFFFh,dst

Emulation

XOR.B #0FFh,dst

Description The destination operand is inverted. The original contents are lost.

Status Bits N: Set if result is negative, reset if positive

Z: Set if dst contained 0FFFFh, reset otherwise

Set if dst contained 0FFh, reset otherwise

C: Set if result is not zero, reset otherwise ( = .NOT. Zero)

V: Set if initial destination operand was negative, otherwise reset

Mode Bits OSCOFF, CPUOFF, and GIE are not affected.

Example Content of R5 is negated (2s complement).

MOV #00AEh,R5 ; R5 = 000AEh

INV R5 ; Invert R5, R5 = 0FF51h

INC R5 ; R5 is now negated, R5 = 0FF52h

Example Content of memory byte LEO is negated.

MOV.B #0AEh,LEO ; MEM(LEO) = 0AEh

INV.B LEO ; Invert LEO, MEM(LEO) = 051h

INC.B LEO ; MEM(LEO) is negated, MEM(LEO) = 052h

186

CPUX SLAU144J–December 2004–Revised July 2013

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