/* Write a program to find the sum of 8 bit variables A and B.
 * For this programming problem the sum may be greater than 255 if A and B
 * are unsigned or less than -128 and greater than 127 if signed.
 * Store the sum into 16 bit variable C using little endian byte ordering.
 * C = A + B
 */

.INCLUDE <m328pdef.inc> 

.DSEG
A:     .BYTE 1
B:     .BYTE 1
C:     .BYTE 2

.CSEG
Adder816:
    ; load
    clr  r1       ; r1:r0 = 0:A
	lds  r0,A
	clr  r3       ; r3:r2 = 0:B
	lds  r2,B
	; add
	add  r0,r2    ; add least significant bytes
    adc  r1,r3    ; add with carry most significant bytes
	; store
	sts  C,r0     ; store least significant byte first
	sts  C+1,r1
	rjmp Adder816