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Instruction Set Description

4.6.3.12 DECX

* DECX.A Decrement destination address-word

* DECX.[W] Decrement destination word

* DECX.B Decrement destination byte

DECX.A dst

Syntax

DECX dst or DECX.W dst

DECX.B dst

Operation dst – 1 → dst

SUBX.A #1,dst

Emulation

SUBX #1,dst

SUBX.B #1,dst

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

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

Z: Set if dst contained 1, reset otherwise

C: Reset if dst contained 0, 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 one.

DECX.A TONI ; Decrement TONI

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SLAU144J–December 2004–Revised July 2013 CPUX

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