流水灯2.asm

单片机应用的基本程序

        ORG 0000H
        AJMP START1
        ORG 000BH
        LJMP BRT
START1: MOV A,#01H
        MOV P1,#01H               
        SETB EA
        SETB ET0
        SETB PT0
        MOV TMOD,#01
START:  MOV TH0,#3CH
        MOV B,#02H
        MOV TL0,#0B0H
        MOV R0,#14H
        SETB TR0        
 LOOP:  JNB TF0,LOOP
 BRT:   DJNZ R0,NEXT
        CJNE A,#80H,L1
		  MOV A,#01H
		  AJMP L2
 L1:    MUL AB
 L2:    MOV P1,A
        CPL A
		  MOV P0,A
		  CPL A
        AJMP L4
 NEXT:  MOV TH0,#3CH
        MOV TL0,#0B0H
        RETI
 L4:    LJMP START
        END