b9-2.asm

汇编语言的设计

	ORG	0000H
	LJMP	MAIN
	ORG 	1000H
MAIN:   MOV 	DPTR,#7FFFH
        CLR 	A
L1:     MOVX 	@DPTR,A
        INC 	A
        CJNE 	A,#0FFH,L1
        DEC 	A
L2:     MOVX 	@DPTR,A
        DEC 	A
        CJNE 	A,#00H,L2
        SJMP 	L1
        END