8051 Program – addition multibyte

; addition multibyte numbers
; input: 4000H - 02H 4010H - 02H
; 4001H - 03H + 4011H - 03H
; 4002H - 04H 4012H - 04H
;output: 4020H - 04H
; 4021H - 06H
; 4022H - 08H
	ORG 0H
	NUM1_ADDR EQU 4000H
	NUM2_ADDR EQU 4010H
	RESULT_ADDR EQU 4020H
	BYTE_COUNT EQU 3
MAIN:
	MOV DPTR,#NUM1_ADDR	; fill memory
	MOV A, #02H
	MOVX @DPTR,A
	INC DPTR
	MOV A, #03H
	MOVX @DPTR,A
	INC DPTR
	MOV A, #04H
	MOVX @DPTR,A
	MOV DPTR,#NUM2_ADDR
	MOV A, #02H
	MOVX @DPTR,A
	INC DPTR
	MOV A, #03H
	MOVX @DPTR,A
	INC DPTR
	MOV A, #04H
	MOVX @DPTR,A
	LCALL MADD
	SJMP MAIN
MADD:
	CLR C
	MOV R4,#BYTE_COUNT
	MOV DPTR,#NUM1_ADDR
	MOV R0,DPL
	MOV R1,DPH
	MOV DPTR,#NUM2_ADDR
	MOV R2,DPL
	MOV R3,DPH
	MOV DPTR,#RESULT_ADDR
loop:
	PUSH DPL
	PUSH DPH
	MOV DPL,R0
	MOV DPH,R1
	MOVX A,@DPTR
	MOV B,A
	INC DPTR
	MOV R0,DPL
	MOV R1,DPH
	MOV DPL,R2
	MOV DPH,R3
	MOVX A,@DPTR
	ADDC A,B
	INC DPTR
	MOV R2,DPL
	MOV R3,DPH
	POP DPH
	POP DPL
	MOVX @DPTR,A
	INC DPTR
	DJNZ R4,loop
	RET
	END

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Related topics:
8051 Program - arithmetic operation 8bit   |   8051 Program - addition 8bit   |   8051 Program - subtraction 8bit   |   8051 Program - multiplication 8bit   |   8051 Program - division 8bit   |   8051 Program - addition 16bit   |   8051 Program - subtraction 16bit   |   8051 Program - multiplication 16bit   |   8051 Program - division 16bit   |   8051 Program - multiplication 16bit by 8bit   |   8051 Program - addition 8bit 2digit bcd   |   8051 Program - memory subroutines   |   8051 Program - math subroutines   |   8051 Program - conversion subroutines

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List of topics: 8051

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