Datasheet

Instruction Set Description

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4.6.3.13 DECDX

* DECDX.A Double-decrement destination address-word

* DECDX.[W] Double-decrement destination word

* DECDX.B Double-decrement destination byte

DECDX.A dst

Syntax

DECDX dst or DECDX.W dst

DECDX.B dst

Operation dst – 2 → dst

SUBX.A #2,dst

Emulation

SUBX #2,dst

SUBX.B #2,dst

Description The destination operand is decremented by two. The original contents are lost.

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

Z: Set if dst contained 2, reset otherwise

C: Reset if dst contained 0 or 1, set otherwise

V: Set if an arithmetic overflow occurs, otherwise reset

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

Example RAM address-word TONI is decremented by two.

DECDX.A TONI ; Decrement TONI

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CPUX SLAU144J–December 2004–Revised July 2013

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