Texas Instruments MSP430x1xx manual Addc.W, Addc.B

Instruction Set

ADDC[.W]	Add source and carry to destination
ADDC.B	Add source and carry to destination
Syntax	ADDC	src,dst	or ADDC.W src,dst
	ADDC.B	src,dst
Operation	src + dst + C −> dst
Description	The source operand and the carry bit (C) are added to the destination operand.
	The source operand is not affected. The previous contents of the destination
	are lost.
Status Bits	N: Set if result is negative, reset if positive
	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 an arithmetic overflow occurs, otherwise reset

Mode Bits	OSCOFF, CPUOFF, and GIE are not affected.
Example	The 32-bit counter pointed to by R13 is added to a 32-bit counter, eleven words
	(20/2 + 2/2) above the pointer in R13.
	ADD	@R13+,20(R13)	; ADD LSDs with no carry in
	ADDC	@R13+,20(R13)	; ADD MSDs with carry
	...		; resulting from the LSDs
Example	The 24-bit counter pointed to by R13 is added to a 24-bit counter, eleven words
	above the pointer in R13.
	ADD.B	@R13+,10(R13)	; ADD LSDs with no carry in
	ADDC.B	@R13+,10(R13)	; ADD medium Bits with carry
	ADDC.B	@R13+,10(R13)	; ADD MSDs with carry
	...		; resulting from the LSDs

RISC 16−Bit CPU 3-23