Datasheet

Instruction Set Description

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4.6.3.3 ADDCX

ADDCX.A Add source address-word and carry to destination address-word

ADDCX.[W] Add source word and carry to destination word

ADDCX.B Add source byte and carry to destination byte

ADDCX.A src,dst

Syntax

ADDCX src,dst or ADDCX.W src,dst

ADDCX.B src,dst

Operation src + dst + C → dst

Description The source operand and the carry bit C are added to the destination operand. The

previous contents of the destination are lost. Both operands may be located in the full

address space.

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 Constant 15 and the carry of the previous instruction are added to the 20-bit counter

CNTR located in two words.

ADDCX.A #15,&CNTR ; Add 15 + C to 20-bit CNTR

Example A table word pointed to by R5 (20-bit address) and the carry C are added to R6. The

jump to label TONI is performed on a carry.

ADDCX.W @R5,R6 ; Add table word + C to R6

JC TONI ; Jump if carry

... ; No carry

Example A table byte pointed to by R5 (20-bit address) and the carry bit C are added to R6. The

jump to label TONI is performed if no carry occurs. The table pointer is auto-incremented

by 1.

ADDCX.B @R5+,R6 ; Add table byte + C to R6. R5 + 1

JNC TONI ; Jump if no carry

... ; Carry occurred

218

CPUX SLAU144J–December 2004–Revised July 2013

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