Datasheet

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Instruction Set Description

4.6.3.16 INVX

* INVX.A Invert destination

* INVX.[W] Invert destination

* INVX.B Invert destination

INVX.A dst

Syntax

INVX dst or INVX.W dst

INVX.B dst

Operation .NOT.dst → dst

XORX.A #0FFFFFh,dst

Emulation

XORX #0FFFFh,dst

XORX.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 0FFFFFh, reset otherwise

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 20-bit content of R5 is negated (2s complement).

INVX.A R5 ; Invert R5

INCX.A R5 ; R5 is now negated

Example Content of memory byte LEO is negated. PC is pointing to upper memory.

INVX.B LEO ; Invert LEO

INCX.B LEO ; MEM(LEO) is negated

231

SLAU144J–December 2004–Revised July 2013 CPUX

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