t2_2

5单片机1实用系统

; t2_2 CALL CADD
       ORG 2000H
       MOV R0,#20H
       MOV R1,#40H
       MOV R3,#02H
       LCALL CADD
;
       ORGD 20H
DATA1: DB 12H,34H
       ORGD 40H
DATA2: DB 11H,11H
; CADD
       ORG 3000H
; 2.2  P_48     CADD
CADD:  MOV     A,R0
       ADD     A,R3
       MOV     R0,A
       DEC     R0
       MOV     A,R1
       ADD     A,R3
       MOV     R1,A
       DEC     R1
       CLR     C
CADL:  MOV     A,@R0
       ADDC    A,@R1
       DA      A
       MOV     @R0,A
       DEC     R0
       DEC     R1
       DJNZ    R3,CADL
       RET
       END