Datasheet

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Instruction Set Description

4.6.2.2 ADD

ADD[.W] Add source word to destination word

ADD.B Add source byte to destination byte

Syntax

ADD src,dst or ADD.W src,dst

ADD.B src,dst

Operation src + dst → dst

Description The source operand is added to the destination operand. The previous content of the

destination is lost.

Status Bits N: Set if result is negative (MSB = 1), reset if positive (MSB = 0)

Z: Set if result is zero, reset otherwise

C: Set if there is a carry from the MSB of the result, reset otherwise

V: Set if the result of two positive operands is negative, or if the result of two negative

numbers is positive, reset otherwise

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

Example Ten is added to the 16-bit counter CNTR located in lower 64KB.

ADD.W #10,&CNTR ; Add 10 to 16-bit counter

Example A table word pointed to by R5 (20-bit address in R5) is added to R6. The jump to label

TONI is performed on a carry.

ADD.W @R5,R6 ; Add table word to R6. R6.19:16 = 0

JC TONI ; Jump if carry

... ; No carry

Example A table byte pointed to by R5 (20-bit address) is added to R6. The jump to label TONI is

performed if no carry occurs. The table pointer is auto-incremented by 1. R6.19:8 = 0

ADD.B @R5+,R6 ; Add byte to R6. R5 + 1. R6: 000xxh

JNC TONI ; Jump if no carry

... ; Carry occurred

165

SLAU144J–December 2004–Revised July 2013 CPUX

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