Datasheet

MSB

LSB

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Instruction Set Description

4.6.3.23 RLAX

* RLAX.A Rotate left arithmetically address-word

* RLAX.[W] Rotate left arithmetically word

* RLAX.B Rotate left arithmetically byte

RLAX.A dst

Syntax

RLAX dst or RLAX.W dst

RLAX.B dst

Operation C ← MSB ← MSB-1 .... LSB+1 ← LSB ← 0

ADDX.A dst,dst

Emulation

ADDX dst,dst

ADDX.B dst,dst

Description The destination operand is shifted left one position as shown in Figure 4-44. The MSB

is shifted into the carry bit (C) and the LSB is filled with 0. The RLAX instruction acts as

a signed multiplication by 2.

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

Z: Set if result is zero, reset otherwise

C: Loaded from the MSB

V: Set if an arithmetic overflow occurs: the initial value is 040000h ≤ dst < 0C0000h;

reset otherwise

Set if an arithmetic overflow occurs: the initial value is 04000h ≤ dst < 0C000h;

reset otherwise

Set if an arithmetic overflow occurs: the initial value is 040h ≤ dst < 0C0h; reset

otherwise

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

Example The 20-bit value in R7 is multiplied by 2

RLAX.A R7 ; Shift left R7 (20-bit)

Figure 4-44. Destination Operand-Arithmetic Shift Left

239

SLAU144J–December 2004–Revised July 2013 CPUX

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