8051 Addition of 16-bit Numbers

The instruction ADDC (add with carry) is used for 16-bit addition. When adding two 16-bit data operands, we need to be concerned with the propagation of a carry from the lower byte to the higher byte.

Program to add 2 16-bit numbers 3CE7H and 3B8DH.

	ORG 0H
MAIN :
	CLR A	; clear accumulator
	CLR C	; clear carry flag
	MOV A, #0E7H
	ADD A, #8DH
	MOV R6, A	; save the low byte of sum
	MOV A, #3CH
	ADDC A, #3BH
	MOV R7, A	; save the high byte of sum
	END	; end of asm source file

---

<< Previous :: Up :: Next >>

---

Related topics:
8051 Addition   |   8051 Addition with Carry   |   8051 Addition of Unsigned Numbers   |   8051 Binary Coded Decimal   |   8051 ADDC Instruction   |   8051 ADD Instruction

---

List of topics: 8051

---