8051 Assembly Address Based 8 bit Addition with carry program

ORG 0000H

CLR C

MOV R2, #00H

MOV DPTR, #0030H

MOVX A, @DPTR

MOV R0, A

INC DPTR

MOVX A, @DPTR

MOV DPTR, #0090H

ADD A, R0

JNC OVER1

INC R2

MOVX @DPTR, A

MOV A, R2

INC DPTR

MOVX @DPTR, A

OVER1: MOVX @DPTR, A

MOV A, R2

INC DPTR

MOVX @DPTR, A

MOV PCON, #02H